diff --git a/src/interaction_optimizers/interaction_optimizers/cmaes_optimization_node.py b/src/interaction_optimizers/interaction_optimizers/cmaes_optimization_node.py
index df24703..ece40bf 100644
--- a/src/interaction_optimizers/interaction_optimizers/cmaes_optimization_node.py
+++ b/src/interaction_optimizers/interaction_optimizers/cmaes_optimization_node.py
@@ -7,6 +7,7 @@ from transitions import Machine
 import cma
 import yaml
 import numpy as np
+from src.interaction_utils.serialization import flatten_population, unflatten_population
 
 # Msg/Srv/Action
 from interaction_msgs.srv import Query
@@ -33,6 +34,7 @@ class CMAESOptimizationNode(Node):
         self.best_rewards_per_iteration = []
         # ROS2 Interfaces
         self.__future = None
+        self.__task_response = None
         # Heartbeat Topics - to make sure that there is no deadlock
         self.heartbeat_timeout = 30     # secs
         self.heartbeat_timer = self.create_timer(1.0, self.check_heartbeats)
@@ -47,6 +49,7 @@ class CMAESOptimizationNode(Node):
 
         # Service
         self.query_srv = self.create_client(Query, 'query_srv')
+        self.task_srv = self.create_client(TaskEvaluation, 'task_srv')
 
         # Define states
         self.states = [
@@ -136,8 +139,14 @@ class CMAESOptimizationNode(Node):
         request.number_of_parameters_per_dimensions = self.number_of_parameters_per_dimensions
 
         population = self.cmaes.ask()
+        flat_population = flatten_population(population)
 
+        request.parameter_array = flat_population
 
+        self.__future = self.task_srv.call_async(request)
+        self.__future.add_done_callback(self.handle_task_response)
+
+        self.data_send_for_evaluation()
 
     def on_enter_interactive_mode(self):
         pass
@@ -187,7 +196,16 @@ class CMAESOptimizationNode(Node):
                 self.non_interaction()
 
         except Exception as e:
-            self.get_logger().error(f'Query service call failed: {str(e)}')
+            self.get_logger().error(f'Query service call failed: {e}')
+            self.error_trigger()
+
+    def handle_task_response(self, future):
+        try:
+            self.__task_response = future.result()
+            self.evaluation_response_received()
+
+        except Exception as e:
+            self.get_logger().error(f'Task service call failed: {e}')
             self.error_trigger()
 
     # endregion
\ No newline at end of file
diff --git a/src/interaction_utils/__init__.py b/src/interaction_utils/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/src/interaction_utils/serialization.py b/src/interaction_utils/serialization.py
new file mode 100644
index 0000000..822c73e
--- /dev/null
+++ b/src/interaction_utils/serialization.py
@@ -0,0 +1,9 @@
+import numpy as np
+
+def flatten_population(population):
+    flattened_parameters = np.array(population).reshape(-1)  # Efficient flattening using NumPy
+    return flattened_parameters
+
+def unflatten_population(flattened_parameters, number_of_population, number_of_dimensions, number_of_parameters_per_dimension):
+    population = flattened_parameters.reshape(number_of_population, number_of_dimensions, number_of_parameters_per_dimension)
+    return population
\ No newline at end of file