THE fundamental idea which HDvO is based upon is the assumption that every program can be described as an interrelation between action and result. Here the concept follows a technical and pragmatical approach. Within HDvO we are proceeding on the following question: "An action is carried out - what is the result?"

A program may be described in the same way. Every program that is called up or every function that is carried out produces one or more results. These results can be described as objects.

Every self-contained functional unit is considered an object. This may be for instance a screen display, a printout etc. Within HDvO various objects are defined for this purpose. This allows you to classify and describe all results of an action in an easy way. All results after triggering an action are shown in a tree.

The following objects are used in HDvO:

	The object Menü (Menu) is used to describe all selection options within a program.
	The object Vorgang (Process) is provided for the description of internal processes.
	A Dialog is any screen output of a program.
	The object Ereignis (Event) is used to describe external influences on the application which then cause a reaction within this application.
	The object Datei (File) is used to describe structures of files.
	In any application that outputs data in the form of documents the object Ausgabe (Output) can be used to describe these documents.