pm#problem_analysis
  exclusion:  environment_analysis  task_analysis  function_analysis  implementation_analysis
  supertype:  knowledge_engineering__knowledgeengineering  making a knowledge based system
     supertype:  real_life_task  a task composed of more basic tasks
        supertype:  task  processes modelled in knowledge acquisition, e.g., a diagnostic
           supertype:  problem_solving_process__problemsolvingproces  cognitive activity to solve a problem
              supertype:  process__proces  situation commonly considered as making a change during some period of time
                 supertype:  situation  something that "occurs" in a real/imaginary region of time and space
                    supertype:  thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type
                 supertype:  process_or_process_description
                    supertype:  processing_thing
                       supertype:  thing_playing_some_role  category to classify things according to roles/viewpoints; classification under this category is application-dependant
                          supertype:  thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type

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