diff --git a/src/cpl/application/application_abc.py b/src/cpl/application/application_abc.py
index 1ad5425f..d5f83021 100644
--- a/src/cpl/application/application_abc.py
+++ b/src/cpl/application/application_abc.py
@@ -12,6 +12,9 @@ class ApplicationABC(ABC):
 
     @abstractmethod
     def __init__(self):
+        """
+        ABC of application
+        """
         self._startup: Optional[StartupABC] = None
         self._app_host: Optional[ApplicationHostABC] = None
         self._configuration: Optional[ConfigurationABC] = None
@@ -19,9 +22,18 @@ class ApplicationABC(ABC):
         self._services: Optional[ServiceProviderABC] = None
 
     def use_startup(self, startup: Type[StartupABC]):
+        """
+        Sets the used startup class
+        :param startup:
+        :return:
+        """
         self._startup = startup()
 
     def build(self):
+        """
+        Creates application host and runtime
+        :return:
+        """
         if self._startup is not None:
             self._app_host = self._startup.create_application_host()
             self._runtime = self._app_host.application_runtime
@@ -29,11 +41,25 @@ class ApplicationABC(ABC):
             self._services = self._startup.create_services()
 
     def run(self):
+        """
+        Entry point
+        :return:
+        """
         self.configure()
         self.main()
 
     @abstractmethod
-    def configure(self): pass
+    def configure(self):
+        """
+        Prepare the application
+        :return:
+        """
+        pass
 
     @abstractmethod
-    def main(self): pass
+    def main(self):
+        """
+        Custom entry point
+        :return:
+        """
+        pass
diff --git a/src/cpl/application/application_host.py b/src/cpl/application/application_host.py
index 35bb3e1e..de82f893 100644
--- a/src/cpl/application/application_host.py
+++ b/src/cpl/application/application_host.py
@@ -1,4 +1,3 @@
-import atexit
 from collections import Callable
 
 from cpl.application.application_host_abc import ApplicationHostABC
@@ -6,7 +5,6 @@ from cpl.application.application_runtime import ApplicationRuntime
 from cpl.application.application_runtime_abc import ApplicationRuntimeABC
 from cpl.configuration.configuration import Configuration
 from cpl.configuration.configuration_abc import ConfigurationABC
-from cpl.console.console import Console
 from cpl.dependency_injection.service_provider import ServiceProvider
 from cpl.dependency_injection.service_provider_abc import ServiceProviderABC
 
@@ -14,6 +12,9 @@ from cpl.dependency_injection.service_provider_abc import ServiceProviderABC
 class ApplicationHost(ApplicationHostABC):
 
     def __init__(self):
+        """
+        Representation of application host
+        """
         ApplicationHostABC.__init__(self)
 
         # Init
@@ -33,9 +34,5 @@ class ApplicationHost(ApplicationHostABC):
     def services(self) -> ServiceProviderABC:
         return self._services
 
-    @staticmethod
-    def output_at_exit():
-        atexit.register(Console.close)
-
     def console_argument_error_function(self, function: Callable):
         self._config.argument_error_function = function
diff --git a/src/cpl/application/application_host_abc.py b/src/cpl/application/application_host_abc.py
index c7ef097b..6f3b73b4 100644
--- a/src/cpl/application/application_host_abc.py
+++ b/src/cpl/application/application_host_abc.py
@@ -9,7 +9,11 @@ from cpl.dependency_injection.service_provider_abc import ServiceProviderABC
 class ApplicationHostABC(ABC):
 
     @abstractmethod
-    def __init__(self): pass
+    def __init__(self):
+        """
+        ABC for application host
+        """
+        pass
 
     @property
     @abstractmethod
@@ -23,9 +27,11 @@ class ApplicationHostABC(ABC):
     @abstractmethod
     def services(self) -> ServiceProviderABC: pass
 
-    @staticmethod
     @abstractmethod
-    def output_at_exit(): pass
-
-    @abstractmethod
-    def console_argument_error_function(self, function: Callable): pass
+    def console_argument_error_function(self, function: Callable):
+        """
+        Defines function to call when a argument error is detected
+        :param function:
+        :return:
+        """
+        pass
diff --git a/src/cpl/application/application_runtime.py b/src/cpl/application/application_runtime.py
index 4325b4ec..84a805d8 100644
--- a/src/cpl/application/application_runtime.py
+++ b/src/cpl/application/application_runtime.py
@@ -8,6 +8,10 @@ from cpl.configuration.configuration_abc import ConfigurationABC
 class ApplicationRuntime(ApplicationRuntimeABC):
 
     def __init__(self, config: ConfigurationABC):
+        """
+        Representation of the application runtime
+        :param config:
+        """
         ApplicationRuntimeABC.__init__(self)
 
         self._app_configuration = config
diff --git a/src/cpl/application/application_runtime_abc.py b/src/cpl/application/application_runtime_abc.py
index 8581fb51..1064881b 100644
--- a/src/cpl/application/application_runtime_abc.py
+++ b/src/cpl/application/application_runtime_abc.py
@@ -7,7 +7,11 @@ from cpl.configuration.configuration_abc import ConfigurationABC
 class ApplicationRuntimeABC(ABC):
 
     @abstractmethod
-    def __init__(self): pass
+    def __init__(self):
+        """
+        ABC for application runtime
+        """
+        pass
 
     @property
     @abstractmethod
@@ -42,4 +46,10 @@ class ApplicationRuntimeABC(ABC):
     def runtime_directory(self) -> str: pass
 
     @abstractmethod
-    def set_runtime_directory(self, runtime_directory: str): pass
+    def set_runtime_directory(self, runtime_directory: str):
+        """
+        Sets the current runtime directory
+        :param runtime_directory:
+        :return:
+        """
+        pass
diff --git a/src/cpl/application/startup_abc.py b/src/cpl/application/startup_abc.py
index 923d680a..3768edb8 100644
--- a/src/cpl/application/startup_abc.py
+++ b/src/cpl/application/startup_abc.py
@@ -8,13 +8,32 @@ from cpl.dependency_injection.service_provider_abc import ServiceProviderABC
 class StartupABC(ABC):
 
     @abstractmethod
-    def __init__(self): pass
+    def __init__(self):
+        """
+        ABC for a startup class
+        """
+        pass
 
     @abstractmethod
-    def create_application_host(self) -> ApplicationHostABC: pass
+    def create_application_host(self) -> ApplicationHostABC:
+        """
+        Creates application host with specific attributes
+        :return: application host
+        """
+        pass
 
     @abstractmethod
-    def create_configuration(self) -> ConfigurationABC: pass
+    def create_configuration(self) -> ConfigurationABC:
+        """
+        Creates configuration of application
+        :return: configuration
+        """
+        pass
 
     @abstractmethod
-    def create_services(self) -> ServiceProviderABC: pass
+    def create_services(self) -> ServiceProviderABC:
+        """
+        Creates service provider
+        :return: service provider
+        """
+        pass