1. Testing method for commencing operation of a system that is controlled with a program logic, comprising: generating a cross-reference list with identifiers used within the program logic and respective locations of use of the identifiers, selecting module identifiers that are used to identify modules within the program logic and respective locations of use of the module identifiers, and generating an overview depiction of at least some requests of a selected one of the modules identified by the respective module identifier, in order to uniquely select at least one specific request of the selected module and observe execution of the uniquely selected module with an editor.