diff --git a/src/core/sheerka/Sheerka.py b/src/core/sheerka/Sheerka.py
index f83c1d2..1ba087d 100644
--- a/src/core/sheerka/Sheerka.py
+++ b/src/core/sheerka/Sheerka.py
@@ -7,19 +7,10 @@ from cache.CacheManager import CacheManager
 from cache.DictionaryCache import DictionaryCache
 from cache.IncCache import IncCache
 from cache.ListIfNeededCache import ListIfNeededCache
-from cache.SetCache import SetCache
 from core.builtin_concepts import BuiltinConcepts, ErrorConcept, ReturnValueConcept, BuiltinErrors, BuiltinUnique, \
     UnknownConcept
 from core.concept import Concept, ConceptParts, PROPERTIES_FOR_NEW
 from core.sheerka.ExecutionContext import ExecutionContext
-from core.sheerka.services.SheerkaCreateNewConcept import SheerkaCreateNewConcept
-from core.sheerka.services.SheerkaDump import SheerkaDump
-from core.sheerka.services.SheerkaEvaluateConcept import SheerkaEvaluateConcept
-from core.sheerka.services.SheerkaExecute import SheerkaExecute
-from core.sheerka.services.SheerkaHistoryManager import SheerkaHistoryManager
-from core.sheerka.services.SheerkaModifyConcept import SheerkaModifyConcept
-from core.sheerka.services.SheerkaSetsManager import SheerkaSetsManager
-from core.sheerka.services.SheerkaVariableManager import SheerkaVariableManager
 from core.sheerka_logger import console_handler
 from printer.SheerkaPrinter import SheerkaPrinter
 from sdp.sheerkaDataProvider import SheerkaDataProvider, Event
@@ -44,9 +35,6 @@ class Sheerka(Concept):
     RESOLVED_CONCEPTS_SYA_DEFINITION_ENTRY = "Resolved_Concepts_Sya_Definitions"
     CONCEPTS_GRAMMARS_ENTRY = "Concepts_Grammars"
 
-    CONCEPTS_GROUPS_ENTRY = "Concepts_Groups"
-    VARIABLES_ENTRY = "Variables"  # entry for admin or internal variables
-
     CONCEPTS_KEYS_ENTRY = "Concepts_Keys"
     BUILTIN_CONCEPTS_KEYS = "Builtins_Concepts"  # sequential key for builtin concepts
     USER_CONCEPTS_KEYS = "User_Concepts"  # sequential key for user defined concepts
@@ -81,15 +69,7 @@ class Sheerka(Concept):
         self.evaluators_prefix: str = None
         self.parsers_prefix: str = None
 
-        self.execute_handler = SheerkaExecute(self)
-        self.create_new_concept_handler = SheerkaCreateNewConcept(self)
-        self.modify_concept_handler = SheerkaModifyConcept(self)
-        self.dump_handler = SheerkaDump(self)
-        self.sets_handler = SheerkaSetsManager(self)
-        self.evaluate_concept_handler = SheerkaEvaluateConcept(self)
-        self.history_handler = SheerkaHistoryManager(self)
         self.printer_handler = SheerkaPrinter(self)
-        self.variable_handler = SheerkaVariableManager(self)
 
         self.during_restore = False
         self._builtins_classes_cache = None
@@ -148,6 +128,7 @@ class Sheerka(Concept):
 
             self.sdp = SheerkaDataProvider(root_folder, self)
             self.initialize_caching()
+            self.initialize_services()
 
             event = Event("Initializing Sheerka.", user_id=self.name)
             self.sdp.save_event(event)
@@ -155,7 +136,6 @@ class Sheerka(Concept):
                 if self.sdp.first_time:
                     self.first_time_initialisation(exec_context)
 
-                self.initialize_services()
                 self.initialize_builtin_parsers()
                 self.initialize_builtin_evaluators()
                 self.initialize_builtin_concepts()
@@ -209,12 +189,6 @@ class Sheerka(Concept):
         self.cache_manager.register_cache(self.CONCEPTS_SYA_DEFINITION_ENTRY, cache)
         self.cache_manager.get(self.CONCEPTS_SYA_DEFINITION_ENTRY, None)  # to init from sdp
 
-        cache = SetCache(default=lambda k: self.sdp.get(self.CONCEPTS_GROUPS_ENTRY, k))
-        self.cache_manager.register_cache(self.CONCEPTS_GROUPS_ENTRY, cache)
-
-        cache = Cache(default=lambda k: self.sdp.get(self.VARIABLES_ENTRY, k))
-        self.cache_manager.register_cache(self.VARIABLES_ENTRY, cache, True, True)
-
         cache = DictionaryCache()
         self.cache_manager.register_cache(self.RESOLVED_CONCEPTS_BY_FIRST_KEYWORD_ENTRY, cache, persist=False)
 
@@ -227,7 +201,7 @@ class Sheerka(Concept):
     def first_time_initialisation(self, context):
 
         self.cache_manager.put(self.CONCEPTS_KEYS_ENTRY, self.USER_CONCEPTS_KEYS, 1000)
-        self.variable_handler.record(context, self.name, "save_execution_context", True)
+        self.record(context, self.name, "save_execution_context", True)
 
     def initialize_services(self):
         """
@@ -375,7 +349,7 @@ class Sheerka(Concept):
             if self.cache_manager.is_dirty:
                 self.cache_manager.commit(execution_context)
 
-            if self.save_execution_context and self.variable_handler.load(self.name, "save_execution_context"):
+            if self.save_execution_context and self.load(self.name, "save_execution_context"):
                 self.sdp.save_result(execution_context)
 
         # # hack to save valid concept definition
@@ -396,25 +370,6 @@ class Sheerka(Concept):
         """
         self.printer_handler.print(result, instructions)
 
-    def record(self, context, who, key, value):
-        return self.variable_handler.record(context, who, key, value)
-
-    def load(self, who, key):
-        return self.variable_handler.load(who, key)
-
-    def delete(self, context, who, key):
-        return self.variable_handler.delete(context, who, key)
-
-    def execute(self, execution_context, return_values, execution_steps):
-        """
-        Executes process for all initial contexts
-        :param execution_context:
-        :param return_values:
-        :param execution_steps:
-        :return:
-        """
-        return self.execute_handler.execute(execution_context, return_values, execution_steps)
-
     def set_id_if_needed(self, obj: Concept, is_builtin: bool):
         """
         Set the key for the concept if needed
@@ -430,39 +385,6 @@ class Sheerka(Concept):
         obj.metadata.id = str(self.cache_manager.get(self.CONCEPTS_KEYS_ENTRY, key))
         self.log.debug(f"Setting id '{obj.metadata.id}' to concept '{obj.metadata.name}'.")
 
-    def create_new_concept(self, context, concept: Concept):
-        """
-        Adds a new concept to the system
-        :param context:
-        :param concept:  DefConceptNode
-        :return: digest of the new concept
-        """
-
-        return self.create_new_concept_handler.create_new_concept(context, concept)
-
-    def modify_concept(self, context, concept: Concept):
-        return self.modify_concept_handler.modify_concept(context, concept)
-
-    def add_concept_to_set(self, context, concept, concept_set):
-        """
-        Add an entry in sdp to tell that concept isa concept_set
-        :param context:
-        :param concept:
-        :param concept_set:
-        :return:
-        """
-        return self.sets_handler.add_concept_to_set(context, concept, concept_set)
-
-    def set_isa(self, context, concept, concept_set):
-        """
-
-        :param context:
-        :param concept:
-        :param concept_set:
-        :return:
-        """
-        return self.sets_handler.set_isa(context, concept, concept_set)
-
     def force_sya_def(self, context, list_of_def):
         """
         Set the precedence and/or the associativity of a concept
@@ -497,27 +419,6 @@ class Sheerka(Concept):
 
         return self.ret(self.name, True, self.new(BuiltinConcepts.SUCCESS))
 
-    def get_set_elements(self, context, concept):
-        """
-        Concept is supposed to be a set
-        Returns all elements if the set
-        :param context:
-        :param concept:
-        :return:
-        """
-
-        return self.sets_handler.get_set_elements(context, concept)
-
-    def evaluate_concept(self, context, concept: Concept):
-        """
-        Evaluation a concept
-        It means that if the where clause is True, will evaluate the body
-        :param context:
-        :param concept:
-        :return: value of the evaluation or error
-        """
-        return self.evaluate_concept_handler.evaluate_concept(context, concept)
-
     def add_in_cache(self, concept: Concept):
         """
         Adds a concept template in cache.
@@ -788,15 +689,6 @@ class Sheerka(Concept):
 
         return a.key == b_key
 
-    def isinset(self, a, b):
-        return self.sets_handler.isinset(a, b)
-
-    def isa(self, a, b):
-        return self.sets_handler.isa(a, b)
-
-    def isaset(self, context, concept):
-        return self.sets_handler.isaset(context, concept)
-
     def get_evaluator_name(self, name):
         if self.evaluators_prefix is None:
             base_evaluator_class = core.utils.get_class("evaluators.BaseEvaluator.BaseEvaluator")
@@ -826,10 +718,6 @@ class Sheerka(Concept):
 
         return sorted(res, key=lambda i: int(i.id))
 
-    def history(self, page=10, start=0):
-        """Gets the history of all commands"""
-        return self.history_handler.history(page, start)
-
     def restore(self):
         """
         Restore the state with all previous valid concept definitions
diff --git a/src/core/sheerka/services/SheerkaCreateNewConcept.py b/src/core/sheerka/services/SheerkaCreateNewConcept.py
index 4fdb74f..ca8d7fa 100644
--- a/src/core/sheerka/services/SheerkaCreateNewConcept.py
+++ b/src/core/sheerka/services/SheerkaCreateNewConcept.py
@@ -1,22 +1,27 @@
 import core.utils
 from core.builtin_concepts import BuiltinConcepts, ErrorConcept
 from core.concept import Concept
+from core.sheerka.services.sheerka_service import BaseService
 from sdp.sheerkaDataProvider import SheerkaDataProviderDuplicateKeyError
 
 BNF_NODE_PARSER_CLASS = "parsers.BnfNodeParser_Old.BnfNodeParser"
 BASE_NODE_PARSER_CLASS = "parsers.BaseNodeParser.BaseNodeParser"
 
 
-class SheerkaCreateNewConcept:
+class SheerkaCreateNewConcept(BaseService):
     """
     Manage the creation of a new concept
     """
 
+    NAME = "CreateNewConcept"
+
     def __init__(self, sheerka):
-        self.sheerka = sheerka
-        self.logger_name = "CreateNewConcept"
+        super().__init__(sheerka)
         self.bnp = core.utils.get_class(BASE_NODE_PARSER_CLASS)  # BaseNodeParser
 
+    def initialize(self):
+        self.sheerka.bind_service_method(self, SheerkaCreateNewConcept.create_new_concept)
+
     def create_new_concept(self, context, concept: Concept):
         """
         Adds a new concept to the system
@@ -36,7 +41,7 @@ class SheerkaCreateNewConcept:
             error = SheerkaDataProviderDuplicateKeyError(sheerka.CONCEPTS_BY_KEY_ENTRY + "." + concept.key,
                                                          concept)
             return sheerka.ret(
-                self.logger_name,
+                self.NAME,
                 False,
                 sheerka.new(BuiltinConcepts.CONCEPT_ALREADY_DEFINED, body=concept),
                 error.args[0])
@@ -47,13 +52,13 @@ class SheerkaCreateNewConcept:
         # update the dictionary of concepts by first key
         init_ret_value = self.bnp.get_concepts_by_first_keyword(context, [concept], True)
         if not init_ret_value.status:
-            return sheerka.ret(self.logger_name, False, ErrorConcept(init_ret_value.value))
+            return sheerka.ret(self.NAME, False, ErrorConcept(init_ret_value.value))
         concepts_by_first_keyword = init_ret_value.body
 
         # update resolved dictionary
         init_ret_value = self.bnp.resolve_concepts_by_first_keyword(context, concepts_by_first_keyword)
         if not init_ret_value.status:
-            return sheerka.ret(self.logger_name, False, ErrorConcept(init_ret_value.value))
+            return sheerka.ret(self.NAME, False, ErrorConcept(init_ret_value.value))
         resolved_concepts_by_first_keyword = init_ret_value.body
 
         concept.freeze_definition_hash()
@@ -66,5 +71,5 @@ class SheerkaCreateNewConcept:
             sheerka.cache_manager.clear(sheerka.CONCEPTS_GRAMMARS_ENTRY)
 
         # process the return if needed
-        ret = sheerka.ret(self.logger_name, True, sheerka.new(BuiltinConcepts.NEW_CONCEPT, body=concept))
+        ret = sheerka.ret(self.NAME, True, sheerka.new(BuiltinConcepts.NEW_CONCEPT, body=concept))
         return ret
diff --git a/src/core/sheerka/services/SheerkaDump.py b/src/core/sheerka/services/SheerkaDump.py
index 4c6154a..1da4bf6 100644
--- a/src/core/sheerka/services/SheerkaDump.py
+++ b/src/core/sheerka/services/SheerkaDump.py
@@ -4,6 +4,7 @@ import pprint
 from core.builtin_concepts import BuiltinConcepts
 from core.concept import Concept
 from core.sheerka.ExecutionContext import ExecutionContext
+from core.sheerka.services.sheerka_service import BaseService
 from sdp.sheerkaDataProvider import SheerkaDataProvider, Event
 
 
@@ -13,9 +14,17 @@ def get_pp():
     return pp
 
 
-class SheerkaDump:
+class SheerkaDump(BaseService):
+
+    NAME = "Dump"
+
     def __init__(self, sheerka):
-        self.sheerka = sheerka
+        super().__init__(sheerka)
+        
+    def initialize(self):
+        self.sheerka.bind_service_method(self, SheerkaDump.dump_concepts, "concepts")
+        self.sheerka.bind_service_method(self, SheerkaDump.dump_desc, "desc")
+        self.sheerka.bind_service_method(self, SheerkaDump.dump_state, "state")
 
     def dump_concepts(self):
         lst = self.sheerka.sdp.list(self.sheerka.CONCEPTS_BY_ID_ENTRY)
@@ -69,28 +78,28 @@ class SheerkaDump:
 
                 first = False
 
-    def dump_history(self, page=20, start=0):
-        count = 0
-        resolved_page = page if page > 0 else 50
-        page_count = 0
-
-        while count < page if page > 0 else True:
-            history = self.sheerka.history(resolved_page, start + page_count * resolved_page)
-            try:
-                h = next(history)
-            except StopIteration:
-                break
-
-            while True:
-                try:
-                    if h.result:
-                        self.sheerka.log.info(h)
-                        count += 1
-                    h = next(history)
-                except StopIteration:
-                    break
-
-            page_count += 1
+    # def dump_history(self, page=20, start=0):
+    #     count = 0
+    #     resolved_page = page if page > 0 else 50
+    #     page_count = 0
+    #
+    #     while count < page if page > 0 else True:
+    #         history = self.sheerka.history(resolved_page, start + page_count * resolved_page)
+    #         try:
+    #             h = next(history)
+    #         except StopIteration:
+    #             break
+    #
+    #         while True:
+    #             try:
+    #                 if h.result:
+    #                     self.sheerka.log.info(h)
+    #                     count += 1
+    #                 h = next(history)
+    #             except StopIteration:
+    #                 break
+    #
+    #         page_count += 1
 
     def dump_state(self):
         snapshot = self.sheerka.sdp.get_snapshot(SheerkaDataProvider.HeadFile)
diff --git a/src/core/sheerka/services/SheerkaEvaluateConcept.py b/src/core/sheerka/services/SheerkaEvaluateConcept.py
index 4b00f7d..d6ca0c5 100644
--- a/src/core/sheerka/services/SheerkaEvaluateConcept.py
+++ b/src/core/sheerka/services/SheerkaEvaluateConcept.py
@@ -1,6 +1,7 @@
 from core.builtin_concepts import BuiltinConcepts
 from core.builtin_helpers import expect_one, only_successful
 from core.concept import Concept, DoNotResolve, ConceptParts, InfiniteRecursionResolved
+from core.sheerka.services.sheerka_service import BaseService
 
 CONCEPT_EVALUATION_STEPS = [
     BuiltinConcepts.BEFORE_EVALUATION,
@@ -8,10 +9,14 @@ CONCEPT_EVALUATION_STEPS = [
     BuiltinConcepts.AFTER_EVALUATION]
 
 
-class SheerkaEvaluateConcept:
+class SheerkaEvaluateConcept(BaseService):
+    NAME = "EvaluateConcept"
+
     def __init__(self, sheerka):
-        self.sheerka = sheerka
-        self.logger_name = "EvaluateConcept"
+        super().__init__(sheerka)
+        
+    def initialize(self):
+        self.sheerka.bind_service_method(self, SheerkaEvaluateConcept.evaluate_concept)
 
     @staticmethod
     def infinite_recursion_detected(context, concept):
@@ -51,14 +56,14 @@ class SheerkaEvaluateConcept:
             if parent.who == context.who and parent.desc == context.desc:
                 body = parent.obj.metadata.body
                 try:
-                    return self.sheerka.ret(self.logger_name, True, InfiniteRecursionResolved(eval(body)))
+                    return self.sheerka.ret(self.NAME, True, InfiniteRecursionResolved(eval(body)))
                 except Exception:
                     pass
                 concepts_found.add(parent.obj)
             parent = parent.get_parent()
 
         return self.sheerka.ret(
-            self.logger_name,
+            self.NAME,
             False,
             self.sheerka.new(BuiltinConcepts.CHICKEN_AND_EGG, body=concepts_found))
 
@@ -71,10 +76,11 @@ class SheerkaEvaluateConcept:
         :param logger:
         :return:
         """
+
         def is_only_successful(r):
-#            return False
+            #            return False
             return context.sheerka.isinstance(r, BuiltinConcepts.RETURN_VALUE) and \
-            context.sheerka.isinstance(r.body, BuiltinConcepts.ONLY_SUCCESSFUL)
+                   context.sheerka.isinstance(r.body, BuiltinConcepts.ONLY_SUCCESSFUL)
 
         steps = [BuiltinConcepts.BEFORE_PARSING, BuiltinConcepts.PARSING, BuiltinConcepts.AFTER_PARSING]
         for part_key in ConceptParts:
@@ -134,7 +140,7 @@ class SheerkaEvaluateConcept:
                 return ret_val.body
 
         desc = f"Evaluating {current_prop} (concept={current_concept})"
-        context.log(desc, self.logger_name)
+        context.log(desc, self.NAME)
         with context.push(desc=desc, obj=current_concept) as sub_context:
 
             if force_evaluation:
diff --git a/src/core/sheerka/services/SheerkaExecute.py b/src/core/sheerka/services/SheerkaExecute.py
index 35217c7..78aec4c 100644
--- a/src/core/sheerka/services/SheerkaExecute.py
+++ b/src/core/sheerka/services/SheerkaExecute.py
@@ -1,18 +1,24 @@
 import core.utils
 from core.builtin_concepts import BuiltinConcepts, ReturnValueConcept
+from core.sheerka.services.sheerka_service import BaseService
 
 NO_MATCH = "** No Match **"
 
 
-class SheerkaExecute:
+class SheerkaExecute(BaseService):
     """
     Manage the execution of a process flow
     """
 
-    def __init__(self, sheerka):
-        self.sheerka = sheerka
+    NAME = "Execute"
 
-    def call_parsers(self, execution_context, return_values):
+    def __init__(self, sheerka):
+        super().__init__(sheerka)
+        
+    def initialize(self):
+        self.sheerka.bind_service_method(self, SheerkaExecute.execute)
+
+    def call_parsers(self, context, return_values):
 
         # return_values must be a list
         if not isinstance(return_values, list):
@@ -35,7 +41,7 @@ class SheerkaExecute:
 
         # group the parsers by priorities
         instantiated_parsers = [parser(sheerka=self.sheerka) for parser in self.sheerka.parsers.values()]
-        instantiated_parsers = self.preprocess(execution_context, instantiated_parsers)
+        instantiated_parsers = self.preprocess(context, instantiated_parsers)
 
         grouped_parsers = {}
         for parser in [p for p in instantiated_parsers if p.enabled]:
@@ -57,10 +63,10 @@ class SheerkaExecute:
                     # if self.sheerka.log.isEnabledFor(logging.DEBUG):
                     #     debug_text = "'" + to_parse + "'" if isinstance(to_parse, str) \
                     #         else "'" + BaseParser.get_text_from_tokens(to_parse) + "' as tokens"
-                    #     execution_context.log(f"Parsing {debug_text}")
+                    #     context.log(f"Parsing {debug_text}")
 
-                    with execution_context.push(desc=f"Parsing using {parser.name}",
-                                                logger=parser.verbose_log) as sub_context:
+                    with context.push(desc=f"Parsing using {parser.name}",
+                                      logger=parser.verbose_log) as sub_context:
                         sub_context.add_inputs(to_parse=to_parse)
                         res = parser.parse(sub_context, to_parse)
                         if res is not None:
@@ -94,7 +100,7 @@ class SheerkaExecute:
         result = core.utils.remove_list_from_list(result, user_inputs)
         return result
 
-    def call_evaluators(self, execution_context, return_values, process_step):
+    def call_evaluators(self, context, return_values, process_step):
 
         # return_values must be a list
         if not isinstance(return_values, list):
@@ -106,7 +112,7 @@ class SheerkaExecute:
         instantiated_evaluators = [e_class() for e_class in self.sheerka.evaluators]
 
         # pre-process evaluators if needed
-        instantiated_evaluators = self.preprocess(execution_context, instantiated_evaluators)
+        instantiated_evaluators = self.preprocess(context, instantiated_evaluators)
 
         for evaluator in [e for e in instantiated_evaluators if e.enabled and process_step in e.steps]:
             grouped_evaluators.setdefault(evaluator.priority, []).append(evaluator)
@@ -117,7 +123,7 @@ class SheerkaExecute:
         # process
         iteration = 0
         while True:
-            with execution_context.push(desc=f"iteration #{iteration}", iteration=iteration) as iteration_context:
+            with context.push(desc=f"iteration #{iteration}", iteration=iteration) as iteration_context:
                 simple_digest = return_values[:]
                 iteration_context.add_inputs(return_values=simple_digest)
 
@@ -127,7 +133,7 @@ class SheerkaExecute:
                     evaluated_items = []
                     to_delete = []
                     for evaluator in grouped_evaluators[priority]:
-                        evaluator = self.preprocess(execution_context, evaluator.__class__())  # fresh copy
+                        evaluator = self.preprocess(context, evaluator.__class__())  # fresh copy
 
                         sub_context_desc = f"Evaluating using {evaluator.name} ({priority=})"
                         with iteration_context.push(desc=sub_context_desc, logger=evaluator.verbose_log) as sub_context:
@@ -194,10 +200,10 @@ class SheerkaExecute:
 
         return return_values
 
-    def execute(self, execution_context, return_values, execution_steps):
+    def execute(self, context, return_values, execution_steps):
         """
         Executes process for all initial contexts
-        :param execution_context:
+        :param context:
         :param return_values:
         :param execution_steps:
         :return:
@@ -205,7 +211,7 @@ class SheerkaExecute:
 
         for step in execution_steps:
             copy = return_values[:] if hasattr(return_values, "__iter__") else [return_values]
-            with execution_context.push(step=step, iteration=0, desc=f"{step=}") as sub_context:
+            with context.push(step=step, iteration=0, desc=f"{step=}") as sub_context:
 
                 if step == BuiltinConcepts.PARSING:
                     return_values = self.call_parsers(sub_context, return_values)
diff --git a/src/core/sheerka/services/SheerkaHistoryManager.py b/src/core/sheerka/services/SheerkaHistoryManager.py
index 0f949d5..e4a03cc 100644
--- a/src/core/sheerka/services/SheerkaHistoryManager.py
+++ b/src/core/sheerka/services/SheerkaHistoryManager.py
@@ -1,5 +1,6 @@
 from collections import namedtuple
 
+from core.sheerka.services.sheerka_service import BaseService
 from sdp.sheerkaDataProvider import Event
 
 hist = namedtuple("HistoryTest", "text status")  # tests purposes only
@@ -42,11 +43,16 @@ class History:
         return self._status
 
 
-class SheerkaHistoryManager:
-    def __init__(self, sheerka):
-        self.sheerka = sheerka
+class SheerkaHistoryManager(BaseService):
+    NAME = "History"
 
-    def history(self, depth, start):
+    def __init__(self, sheerka):
+        super().__init__(sheerka)
+
+    def initialize(self):
+        self.sheerka.bind_service_method(self, SheerkaHistoryManager.history)
+
+    def history(self, depth=10, start=0):
         """
         Load history
         :param depth: number of items
diff --git a/src/core/sheerka/services/SheerkaModifyConcept.py b/src/core/sheerka/services/SheerkaModifyConcept.py
index f640d17..319bfd0 100644
--- a/src/core/sheerka/services/SheerkaModifyConcept.py
+++ b/src/core/sheerka/services/SheerkaModifyConcept.py
@@ -1,10 +1,15 @@
 from core.builtin_concepts import BuiltinConcepts
+from core.sheerka.services.sheerka_service import BaseService
 
 
-class SheerkaModifyConcept:
+class SheerkaModifyConcept(BaseService):
+    NAME = "ModifyConcept"
+    
     def __init__(self, sheerka):
-        self.sheerka = sheerka
-        self.logger_name = "ModifyConcept"
+        super().__init__(sheerka)
+
+    def initialize(self):
+        self.sheerka.bind_service_method(self, SheerkaModifyConcept.modify_concept)
 
     def modify_concept(self, context, concept):
         old_version = self.sheerka.get_by_id(concept.id)
@@ -12,7 +17,7 @@ class SheerkaModifyConcept:
         if old_version is None:
             # nothing found in cache
             return self.sheerka.ret(
-                self.logger_name, False,
+                self.NAME, False,
                 self.sheerka.new(
                     BuiltinConcepts.UNKNOWN_CONCEPT,
                     body=[("key", concept.key), ("id", concept.id)]))
@@ -20,13 +25,13 @@ class SheerkaModifyConcept:
         if not self.sheerka.is_success(old_version) and concept.key != old_version.key:
             # an error concept is returned
             return self.sheerka.ret(
-                self.logger_name, False,
+                self.NAME, False,
                 old_version)
 
         if old_version == concept:
             # the concept is not modified
             return self.sheerka.ret(
-                self.logger_name, False,
+                self.NAME, False,
                 self.sheerka.new(
                     BuiltinConcepts.CONCEPT_ALREADY_DEFINED,
                     body=concept))
@@ -37,5 +42,5 @@ class SheerkaModifyConcept:
         # TODO : update resolved by first keyword
         # TODO : update concepts grammars
 
-        ret = self.sheerka.ret(self.logger_name, True, self.sheerka.new(BuiltinConcepts.NEW_CONCEPT, body=concept))
+        ret = self.sheerka.ret(self.NAME, True, self.sheerka.new(BuiltinConcepts.NEW_CONCEPT, body=concept))
         return ret
diff --git a/src/core/sheerka/services/SheerkaSetsManager.py b/src/core/sheerka/services/SheerkaSetsManager.py
index 732aca1..57c0b65 100644
--- a/src/core/sheerka/services/SheerkaSetsManager.py
+++ b/src/core/sheerka/services/SheerkaSetsManager.py
@@ -1,15 +1,30 @@
 import core.builtin_helpers
+from cache.SetCache import SetCache
 from core.ast.nodes import python_to_concept
 from core.builtin_concepts import BuiltinConcepts
 from core.concept import Concept, ConceptParts
+from core.sheerka.services.sheerka_service import BaseService
 
 GROUP_PREFIX = 'All_'
 
 
-class SheerkaSetsManager:
+class SheerkaSetsManager(BaseService):
+    NAME = "SetsManager"
+    CONCEPTS_GROUPS_ENTRY = "Concepts_Groups"
+
     def __init__(self, sheerka):
-        self.sheerka = sheerka
-        self.logger_name = "SetsManager"
+        super().__init__(sheerka)
+
+    def initialize(self):
+        self.sheerka.bind_service_method(self, SheerkaSetsManager.set_isa)
+        self.sheerka.bind_service_method(self, SheerkaSetsManager.get_set_elements)
+        self.sheerka.bind_service_method(self, SheerkaSetsManager.add_concept_to_set)
+        self.sheerka.bind_service_method(self, SheerkaSetsManager.isinset)
+        self.sheerka.bind_service_method(self, SheerkaSetsManager.isa)
+        self.sheerka.bind_service_method(self, SheerkaSetsManager.isaset)
+
+        cache = SetCache(default=lambda k: self.sheerka.sdp.get(self.CONCEPTS_GROUPS_ENTRY, k))
+        self.sheerka.cache_manager.register_cache(self.CONCEPTS_GROUPS_ENTRY, cache)
 
     def set_isa(self, context, concept, concept_set):
         """
@@ -20,11 +35,11 @@ class SheerkaSetsManager:
         :return:
         """
 
-        context.log(f"Setting concept {concept} is a {concept_set}", who=self.logger_name)
+        context.log(f"Setting concept {concept} is a {concept_set}", who=self.NAME)
 
         if BuiltinConcepts.ISA in concept.metadata.props and concept_set in concept.metadata.props[BuiltinConcepts.ISA]:
             return self.sheerka.ret(
-                self.logger_name,
+                self.NAME,
                 False,
                 self.sheerka.new(BuiltinConcepts.CONCEPT_ALREADY_IN_SET, body=concept, concept_set=concept_set))
 
@@ -45,25 +60,25 @@ class SheerkaSetsManager:
         :return:
         """
 
-        context.log(f"Adding concept {concept} to set {concept_set}", who=self.logger_name)
+        context.log(f"Adding concept {concept} to set {concept_set}", who=self.NAME)
 
         assert concept.id
         assert concept_set.id
 
-        set_elements = self.sheerka.cache_manager.get(self.sheerka.CONCEPTS_GROUPS_ENTRY, concept_set.id)
+        set_elements = self.sheerka.cache_manager.get(self.CONCEPTS_GROUPS_ENTRY, concept_set.id)
         if set_elements and concept.id in set_elements:
             return self.sheerka.ret(
-                self.logger_name,
+                self.NAME,
                 False,
                 self.sheerka.new(BuiltinConcepts.CONCEPT_ALREADY_IN_SET, body=concept, concept_set=concept_set))
 
-        self.sheerka.cache_manager.put(self.sheerka.CONCEPTS_GROUPS_ENTRY, concept_set.id, concept.id)
-        return self.sheerka.ret(self.logger_name, True, self.sheerka.new(BuiltinConcepts.SUCCESS))
+        self.sheerka.cache_manager.put(self.CONCEPTS_GROUPS_ENTRY, concept_set.id, concept.id)
+        return self.sheerka.ret(self.NAME, True, self.sheerka.new(BuiltinConcepts.SUCCESS))
 
     def add_concepts_to_set(self, context, concepts, concept_set):
         """Adding multiple concepts at the same time"""
 
-        context.log(f"Adding concepts {concepts} to set {concept_set}", who=self.logger_name)
+        context.log(f"Adding concepts {concepts} to set {concept_set}", who=self.NAME)
         already_in_set = []
         for concept in concepts:
             res = self.add_concept_to_set(context, concept, concept_set)
@@ -77,7 +92,7 @@ class SheerkaSetsManager:
         else:
             body = self.sheerka.new(BuiltinConcepts.SUCCESS)
 
-        return self.sheerka.ret(self.logger_name, len(already_in_set) != len(concepts), body)
+        return self.sheerka.ret(self.NAME, len(already_in_set) != len(concepts), body)
 
     def get_set_elements(self, context, concept):
         """
@@ -93,7 +108,7 @@ class SheerkaSetsManager:
                 return self.sheerka.new(BuiltinConcepts.NOT_A_SET, body=concept)
 
             # first, try to see if sub_context has it's own group entry
-            ids = self.sheerka.cache_manager.get(self.sheerka.CONCEPTS_GROUPS_ENTRY, sub_concept.id)
+            ids = self.sheerka.cache_manager.get(self.CONCEPTS_GROUPS_ENTRY, sub_concept.id)
             concepts = self._get_concepts(context, ids, True)
 
             # aggregate with en entries from its body
@@ -143,7 +158,7 @@ class SheerkaSetsManager:
         if not (a.id and b.id):
             return False
 
-        group_elements = self.sheerka.cache_manager.get(self.sheerka.CONCEPTS_GROUPS_ENTRY, b.id)
+        group_elements = self.sheerka.cache_manager.get(self.CONCEPTS_GROUPS_ENTRY, b.id)
         return group_elements and a.id in group_elements
 
     def isa(self, a, b):
@@ -173,7 +188,7 @@ class SheerkaSetsManager:
 
         # check if it has a group
         # TODO: use cache instead of directly requesting sdp
-        if self.sheerka.cache_manager.get(self.sheerka.CONCEPTS_GROUPS_ENTRY, concept.id):
+        if self.sheerka.cache_manager.get(self.CONCEPTS_GROUPS_ENTRY, concept.id):
             return True
 
         # it may be a concept that references a set
diff --git a/src/core/sheerka/services/SheerkaVariableManager.py b/src/core/sheerka/services/SheerkaVariableManager.py
index 3fa2e95..c40b745 100644
--- a/src/core/sheerka/services/SheerkaVariableManager.py
+++ b/src/core/sheerka/services/SheerkaVariableManager.py
@@ -1,7 +1,8 @@
 from dataclasses import dataclass
 from typing import List
 
-from core.sheerka.services.sheerka_service import ServiceObj
+from cache.Cache import Cache
+from core.sheerka.services.sheerka_service import ServiceObj, BaseService
 
 
 @dataclass
@@ -18,10 +19,20 @@ class Variable(ServiceObj):
         return f"{self.who}|{self.key}"
 
 
-class SheerkaVariableManager:
+class SheerkaVariableManager(BaseService):
+    NAME = "VariableManager"
+    VARIABLES_ENTRY = "Variables"  # entry for admin or internal variables
 
     def __init__(self, sheerka):
-        self.sheerka = sheerka
+        super().__init__(sheerka)
+
+    def initialize(self):
+        self.sheerka.bind_service_method(self, SheerkaVariableManager.record)
+        self.sheerka.bind_service_method(self, SheerkaVariableManager.load)
+        self.sheerka.bind_service_method(self, SheerkaVariableManager.delete)
+
+        cache = Cache(default=lambda k: self.sheerka.sdp.get(self.VARIABLES_ENTRY, k))
+        self.sheerka.cache_manager.register_cache(self.VARIABLES_ENTRY, cache, True, True)
 
     def record(self, context, who, key, value):
         """
@@ -34,14 +45,14 @@ class SheerkaVariableManager:
         """
 
         variable = Variable(context.event.get_digest(), who, key, value, None)
-        self.sheerka.cache_manager.put(self.sheerka.VARIABLES_ENTRY, variable.get_key(), variable)
+        self.sheerka.cache_manager.put(self.VARIABLES_ENTRY, variable.get_key(), variable)
 
     def load(self, who, key):
-        variable = self.sheerka.cache_manager.get(self.sheerka.VARIABLES_ENTRY, who + "|" + key)
+        variable = self.sheerka.cache_manager.get(self.VARIABLES_ENTRY, who + "|" + key)
         if variable is None:
             return None
 
         return variable.value
 
     def delete(self, context, who, key):
-        self.sheerka.cache_manager.delete(self.sheerka.VARIABLES_ENTRY, who + "|" + key)
+        self.sheerka.cache_manager.delete(self.VARIABLES_ENTRY, who + "|" + key)
diff --git a/src/core/sheerka/services/sheerka_service.py b/src/core/sheerka/services/sheerka_service.py
index 52eb297..52e8e72 100644
--- a/src/core/sheerka/services/sheerka_service.py
+++ b/src/core/sheerka/services/sheerka_service.py
@@ -12,3 +12,10 @@ class BaseService:
     """
     def __init__(self, sheerka):
         self.sheerka = sheerka
+
+    def initialize(self):
+        """
+        Adds cache or bind methods
+        :return:
+        """
+        pass
diff --git a/src/evaluators/PythonEvaluator.py b/src/evaluators/PythonEvaluator.py
index 076eacf..da7a775 100644
--- a/src/evaluators/PythonEvaluator.py
+++ b/src/evaluators/PythonEvaluator.py
@@ -66,10 +66,10 @@ class PythonEvaluator(OneReturnValueEvaluator):
     def get_globals(self, context, node):
         my_locals = {
             "sheerka": context.sheerka,
-            "desc": context.sheerka.dump_handler.dump_desc,
-            "concepts": context.sheerka.dump_handler.dump_concepts,
-            "history": context.sheerka.dump_handler.dump_history,
-            "state": context.sheerka.dump_handler.dump_state,
+            # "desc": context.sheerka.dump_handler.dump_desc,
+            # "concepts": context.sheerka.dump_handler.dump_concepts,
+            # "history": context.sheerka.dump_handler.dump_history,
+            # "state": context.sheerka.dump_handler.dump_state,
             "Concept": core.concept.Concept,
             "BuiltinConcepts": core.builtin_concepts.BuiltinConcepts,
         }
diff --git a/tests/core/test_SheerkaSetsManager.py b/tests/core/test_SheerkaSetsManager.py
index 7db7f48..9710079 100644
--- a/tests/core/test_SheerkaSetsManager.py
+++ b/tests/core/test_SheerkaSetsManager.py
@@ -1,5 +1,6 @@
 from core.builtin_concepts import BuiltinConcepts
 from core.concept import Concept
+from core.sheerka.services.SheerkaSetsManager import SheerkaSetsManager
 
 from tests.TestUsingFileBasedSheerka import TestUsingFileBasedSheerka
 from tests.TestUsingMemoryBasedSheerka import TestUsingMemoryBasedSheerka
@@ -15,12 +16,12 @@ class TestSheerkaSetsManager(TestUsingMemoryBasedSheerka):
         )
         assert sheerka.add_concept_to_set(context, foo, group).status
 
-        group_elements = sheerka.cache_manager.get(sheerka.CONCEPTS_GROUPS_ENTRY, group.id)
+        group_elements = sheerka.cache_manager.get(SheerkaSetsManager.CONCEPTS_GROUPS_ENTRY, group.id)
         assert group_elements == {foo.id}
 
         # it can be persisted
         sheerka.cache_manager.commit(context)
-        assert sheerka.sdp.get(sheerka.CONCEPTS_GROUPS_ENTRY, group.id) == {foo.id}
+        assert sheerka.sdp.get(SheerkaSetsManager.CONCEPTS_GROUPS_ENTRY, group.id) == {foo.id}
 
     def test_i_cannot_add_the_same_concept_twice_in_a_set(self):
         sheerka, context, foo, group = self.init_concepts(Concept("foo"), Concept("group"))
@@ -34,7 +35,7 @@ class TestSheerkaSetsManager(TestUsingMemoryBasedSheerka):
         assert res.body.body == foo
         assert res.body.concept_set == group
 
-        all_entries = sheerka.cache_manager.get(sheerka.CONCEPTS_GROUPS_ENTRY, group.id)
+        all_entries = sheerka.cache_manager.get(SheerkaSetsManager.CONCEPTS_GROUPS_ENTRY, group.id)
         assert all_entries == {foo.id}
 
     def test_i_can_have_multiple_groups(self):
@@ -52,12 +53,12 @@ class TestSheerkaSetsManager(TestUsingMemoryBasedSheerka):
         assert sheerka.add_concept_to_set(context, bar, group2).status
         assert sheerka.add_concept_to_set(context, baz, group2).status
 
-        assert sheerka.cache_manager.get(sheerka.CONCEPTS_GROUPS_ENTRY, group1.id) == {foo.id, bar.id}
-        assert sheerka.cache_manager.get(sheerka.CONCEPTS_GROUPS_ENTRY, group2.id) == {baz.id, bar.id}
+        assert sheerka.cache_manager.get(SheerkaSetsManager.CONCEPTS_GROUPS_ENTRY, group1.id) == {foo.id, bar.id}
+        assert sheerka.cache_manager.get(SheerkaSetsManager.CONCEPTS_GROUPS_ENTRY, group2.id) == {baz.id, bar.id}
 
         # I can save in db
         sheerka.cache_manager.commit(context)
-        assert sheerka.sdp.get(sheerka.CONCEPTS_GROUPS_ENTRY) == {
+        assert sheerka.sdp.get(SheerkaSetsManager.CONCEPTS_GROUPS_ENTRY) == {
             '1004': {'1001', '1002'}, '1005': {'1002', '1003'}
         }
 
@@ -95,7 +96,8 @@ class TestSheerkaSetsManager(TestUsingMemoryBasedSheerka):
         sheerka, context, foo, bar, group1, group2 = self.init_concepts(
             "foo", "bar", "group1", Concept("group2", body="group1"))
 
-        sheerka.sets_handler.add_concepts_to_set(context, [foo, bar], group1)
+        service = sheerka.services[SheerkaSetsManager.NAME]
+        service.add_concepts_to_set(context, [foo, bar], group1)
 
         assert sheerka.isaset(context, group2)
         assert set(sheerka.get_set_elements(context, group2)) == {foo, bar}
@@ -110,7 +112,8 @@ class TestSheerkaSetsManager(TestUsingMemoryBasedSheerka):
             Concept("number"),
             Concept("sub_number", body="number", where="number < 4")
         )
-        sheerka.sets_handler.add_concepts_to_set(context, [one, two, three, four, five], number)
+        service = sheerka.services[SheerkaSetsManager.NAME]
+        service.add_concepts_to_set(context, [one, two, three, four, five], number)
 
         assert sheerka.isaset(context, sub_number)
         assert set(sheerka.get_set_elements(context, sub_number)) == {one, two, three}
@@ -126,7 +129,8 @@ class TestSheerkaSetsManager(TestUsingMemoryBasedSheerka):
             Concept("sub_number", body="number", where="number < 4"),
             Concept("sub_sub_number", body="sub_number", where="sub_number > 2")
         )
-        sheerka.sets_handler.add_concepts_to_set(context, [one, two, three, four, five], number)
+        service = sheerka.services[SheerkaSetsManager.NAME]
+        service.add_concepts_to_set(context, [one, two, three, four, five], number)
 
         assert sheerka.isaset(context, sub_sub_number)
         assert set(sheerka.get_set_elements(context, sub_sub_number)) == {three}
@@ -149,7 +153,8 @@ class TestSheerkaSetsManager(TestUsingMemoryBasedSheerka):
             Concept("number"),
             Concept("sub_number", body="number", where="number < 4")
         )
-        sheerka.sets_handler.add_concepts_to_set(context, [one, two, three, four, five], number)
+        service = sheerka.services[SheerkaSetsManager.NAME]
+        service.add_concepts_to_set(context, [one, two, three, four, five], number)
 
         assert sheerka.isaset(context, sub_number)
         assert set(sheerka.get_set_elements(context, sub_number)) == {one, three}
@@ -170,8 +175,8 @@ class TestSheerkaSetsManager(TestUsingMemoryBasedSheerka):
             Concept("number"),
             Concept("sub_number", body="number", where="number >= 20")
         )
-
-        sheerka.sets_handler.add_concepts_to_set(context, [one, two, twenty, twenties], number)
+        service = sheerka.services[SheerkaSetsManager.NAME]
+        service.add_concepts_to_set(context, [one, two, twenty, twenties], number)
 
         assert sheerka.isaset(context, sub_number)
         assert sheerka.get_set_elements(context, sub_number) == [twenty]  # what is expected ?
@@ -195,8 +200,8 @@ class TestSheerkaSetsManager(TestUsingMemoryBasedSheerka):
             Concept("number"),
             create_new=True
         )
-
-        sheerka.sets_handler.add_concepts_to_set(context, [one, two, twenty, twenties], number)
+        service = sheerka.services[SheerkaSetsManager.NAME]
+        service.add_concepts_to_set(context, [one, two, twenty, twenties], number)
         assert sheerka.isinset(twenties, number)
 
         twenty_one = sheerka.evaluate_user_input("twenty one", "")[0].body
@@ -264,7 +269,7 @@ class TestSheerkaSetsManagerUsingFileBasedSheerka(TestUsingFileBasedSheerka):
         assert set(sheerka.get_set_elements(context, group)) == {foo, bar}
 
         sheerka.cache_manager.commit(context)  # save in db
-        all_entries = sheerka.sdp.get(sheerka.CONCEPTS_GROUPS_ENTRY)  # check the db
+        all_entries = sheerka.sdp.get(SheerkaSetsManager.CONCEPTS_GROUPS_ENTRY)  # check the db
         assert all_entries == {
             group.id: {foo.id, bar.id}
         }
@@ -275,15 +280,16 @@ class TestSheerkaSetsManagerUsingFileBasedSheerka(TestUsingFileBasedSheerka):
         foo4 = Concept("foo4")
         for c in [foo3, foo4]:
             sheerka.create_new_concept(context, c)
-
-        res = sheerka.sets_handler.add_concepts_to_set(context, (foo3, foo4), group)
+        
+        sets_handler = sheerka.services[SheerkaSetsManager.NAME]
+        res = sets_handler.add_concepts_to_set(context, (foo3, foo4), group)
         assert res.status
 
         # I can get the elements
         assert set(sheerka.get_set_elements(context, group)) == {foo, bar, foo3, foo4}
 
         sheerka.cache_manager.commit(context)  # save in db
-        all_entries = sheerka.sdp.get(sheerka.CONCEPTS_GROUPS_ENTRY)  # check the db
+        all_entries = sheerka.sdp.get(SheerkaSetsManager.CONCEPTS_GROUPS_ENTRY)  # check the db
         assert all_entries == {
             group.id: {foo.id, bar.id, foo3.id, foo4.id}
         }
@@ -322,7 +328,7 @@ class TestSheerkaSetsManagerUsingFileBasedSheerka(TestUsingFileBasedSheerka):
 
         # they are both in the same group
         sheerka = self.get_sheerka()
-        all_entries = sheerka.sdp.get(sheerka.CONCEPTS_GROUPS_ENTRY)
+        all_entries = sheerka.sdp.get(SheerkaSetsManager.CONCEPTS_GROUPS_ENTRY)
         assert all_entries == {
             group.id: {foo.id, bar.id}
         }
diff --git a/tests/core/test_SheerkaVariableManager.py b/tests/core/test_SheerkaVariableManager.py
index b8982f4..f210413 100644
--- a/tests/core/test_SheerkaVariableManager.py
+++ b/tests/core/test_SheerkaVariableManager.py
@@ -1,5 +1,6 @@
 from core.concept import Concept, ConceptParts
 from core.sheerka.Sheerka import Sheerka
+from core.sheerka.services.SheerkaVariableManager import SheerkaVariableManager
 
 from tests.TestUsingMemoryBasedSheerka import TestUsingMemoryBasedSheerka
 
@@ -16,8 +17,8 @@ class TestSheerkaVariable(TestUsingMemoryBasedSheerka):
         # I can persist in db
         sheerka.cache_manager.commit(context)
 
-        assert sheerka.sdp.exists(Sheerka.VARIABLES_ENTRY, "TestSheerkaVariable|my_variable")
-        loaded = sheerka.sdp.get(Sheerka.VARIABLES_ENTRY, "TestSheerkaVariable|my_variable")
+        assert sheerka.sdp.exists(SheerkaVariableManager.VARIABLES_ENTRY, "TestSheerkaVariable|my_variable")
+        loaded = sheerka.sdp.get(SheerkaVariableManager.VARIABLES_ENTRY, "TestSheerkaVariable|my_variable")
         assert loaded.event_id == context.event.get_digest()
         assert loaded.key == "my_variable"
         assert loaded.value == 1
@@ -58,7 +59,7 @@ class TestSheerkaVariable(TestUsingMemoryBasedSheerka):
     #     res = sheerka.load("TestSheerkaVariable", "my_variable")
     #     assert res == 2
     #
-    #     loaded = sheerka.sdp.get(Sheerka.VARIABLES_ENTRY, "TestSheerkaVariable.my_variable")
+    #     loaded = sheerka.sdp.get(SheerkaVariableManager.VARIABLES_ENTRY, "TestSheerkaVariable.my_variable")
     #     assert loaded.event_id == context.event.get_digest()
     #     assert loaded.key == "my_variable"
     #     assert loaded.value == 2
@@ -79,7 +80,7 @@ class TestSheerkaVariable(TestUsingMemoryBasedSheerka):
     #     sheerka.record(context, "TestSheerkaVariable", "my_variable", 1)
     #     sheerka.record(context, "TestSheerkaVariable", "my_variable", 1)
     #
-    #     loaded = sheerka.sdp.get(Sheerka.VARIABLES_ENTRY, "TestSheerkaVariable.my_variable")
+    #     loaded = sheerka.sdp.get(SheerkaVariableManager.VARIABLES_ENTRY, "TestSheerkaVariable.my_variable")
     #     assert loaded.event_id == context.event.get_digest()
     #     assert loaded.key == "my_variable"
     #     assert loaded.value == 1
diff --git a/tests/core/test_sheerka.py b/tests/core/test_sheerka.py
index e889117..8134bbc 100644
--- a/tests/core/test_sheerka.py
+++ b/tests/core/test_sheerka.py
@@ -21,7 +21,7 @@ class TestSheerkaUsingMemoryBasedSheerka(TestUsingMemoryBasedSheerka):
 
         assert len(sheerka.services) > 0
         assert None not in sheerka.services
-        assert "ComparisonManager" in sheerka.services  # test at least one service
+        assert "VariableManager" in sheerka.services  # test at least one service
 
     def test_i_can_initialize_builtin_parsers(self):
         sheerka = self.get_sheerka()
diff --git a/tests/evaluators/test_EvalEvaluator.py b/tests/evaluators/test_EvalEvaluator.py
index 9189beb..363bff6 100644
--- a/tests/evaluators/test_EvalEvaluator.py
+++ b/tests/evaluators/test_EvalEvaluator.py
@@ -2,6 +2,7 @@ import pytest
 
 from core.builtin_concepts import ReturnValueConcept, BuiltinConcepts
 from core.concept import Concept
+from core.sheerka.services.SheerkaSetsManager import SheerkaSetsManager
 from evaluators.EvalEvaluator import EvalEvaluator
 from tests.TestUsingMemoryBasedSheerka import TestUsingMemoryBasedSheerka
 
@@ -69,7 +70,8 @@ class TestEvalEvaluator(TestUsingMemoryBasedSheerka):
             Concept("bar"),
             Concept("baz"),
             Concept("number"))
-        sheerka.sets_handler.add_concepts_to_set(context, [foo, bar, baz], number)
+        sets_handler = sheerka.services[SheerkaSetsManager.NAME]
+        sets_handler.add_concepts_to_set(context, [foo, bar, baz], number)
 
         evaluated = EvalEvaluator().eval(context, [retval(number)])