diff --git a/src/argenta/response/status.py b/src/argenta/response/status.py
index fe7bf5a..9757d60 100644
--- a/src/argenta/response/status.py
+++ b/src/argenta/response/status.py
@@ -3,4 +3,6 @@ from enum import Enum
 
 class Status(Enum):
     SUCCESSFUL = 200
+    partSUCCESSFUL = 206
     UNSUCCESSFUL = 400
+
diff --git a/src/argenta/router/command_handler/entity.py b/src/argenta/router/command_handler/entity.py
index 1c2f3b4..942fd91 100644
--- a/src/argenta/router/command_handler/entity.py
+++ b/src/argenta/router/command_handler/entity.py
@@ -1,12 +1,11 @@
 from typing import Callable, Iterator
 
 from argenta.command import Command
-from argenta.command.flags.models import InputFlags
-
+from argenta.response import Response
 
 
 class CommandHandler:
-    def __init__(self, handler: Callable[[], None] | Callable[[InputFlags], None], handled_command: Command):
+    def __init__(self, handler: Callable[[Response], None], handled_command: Command):
         """
         Private. Entity of the model linking the handler and the command being processed
         :param handler: the handler being called
@@ -15,21 +14,18 @@ class CommandHandler:
         self._handler = handler
         self._handled_command = handled_command
 
-    def handling(self, input_flags: InputFlags = None) -> None:
+    def handling(self, response: Response) -> None:
         """
         Private. Direct processing of an input command
-        :param input_flags: the flags of the input command
+        :param response: the entity of response: various groups of flags and status of response
         :return: None
         """
-        if input_flags is not None:
-            self._handler(input_flags)
-        else:
-            self._handler()
+        self._handler(response)
 
-    def get_handler(self) -> Callable[[], None] | Callable[[InputFlags], None]:
+    def get_handler(self) -> Callable[[Response], None]:
         """
         Private. Returns the handler being called
-        :return: the handler being called as Callable[[], None] or Callable[[InputFlags], None]
+        :return: the handler being called as Callable[[Response], None]
         """
         return self._handler
 
diff --git a/src/argenta/router/entity.py b/src/argenta/router/entity.py
index a7f9ce6..e945cd1 100644
--- a/src/argenta/router/entity.py
+++ b/src/argenta/router/entity.py
@@ -4,7 +4,6 @@ from argenta.command import Command
 from argenta.command.models import InputCommand
 from argenta.response import Response, Status
 from argenta.router.command_handler.entity import CommandHandlers, CommandHandler
-from argenta.command.flag.models import Flag
 from argenta.command.flags.models import Flags, InputFlags, UndefinedInputFlags, ValidInputFlags, InvalidValueInputFlags
 from argenta.router.exceptions import (RepeatedFlagNameException,
                                        TooManyTransferredArgsException,
@@ -30,7 +29,7 @@ class Router:
         """
         Public. Registers handler
         :param command: Registered command
-        :return: decorated handler as Callable[[Any], Any]
+        :return: decorated handler as Callable
         """
         self._validate_command(command)
 
@@ -75,29 +74,26 @@ class Router:
             if input_command_flags.get_flags():
                 response.status = Status.SUCCESSFUL
                 flags = self._validate_input_flags(handle_command, input_command_flags)
-                response.valid_flags, response.undefined_flags, response.invalid_flags = flags
+                response.valid_flags, response.undefined_flags, response.invalid_value_flags = flags
                 command_handler.handling(response)
-                return
             else:
                 response.status = Status.SUCCESSFUL
                 command_handler.handling(response)
-                return
         else:
             if input_command_flags.get_flags():
                 response.status = Status.UNSUCCESSFUL
-                response.undefined_flags = UndefinedInputFlags(*input_command_flags)
+                response.undefined_flags = UndefinedInputFlags()
+                response.undefined_flags.add_flags(input_command_flags.get_flags())
                 command_handler.handling(response)
-                return
             else:
                 response.status = Status.SUCCESSFUL
                 command_handler.handling(response)
-                return
 
 
     @staticmethod
-    def _validate_input_flags(handled_command: Command, input_flags: InputFlags) -> (ValidInputFlags,
-                                                                                     UndefinedInputFlags,
-                                                                                     InvalidValueInputFlags):
+    def _validate_input_flags(handled_command: Command, input_flags: InputFlags) -> tuple[ValidInputFlags,
+                                                                                          UndefinedInputFlags,
+                                                                                          InvalidValueInputFlags]:
         """
         Private. Validates flags of input command
         :param handled_command: entity of the handled command