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Model based requirement, :red_flag:1, 1, 2, 3, 4, 5, 6, 7, 10, 11, 12, 13 …

- - - - models map reality
      - represent existing reality
      - represent of reality to be created
- - - - simple
      - transition
  - - - diagram
      - example
    - - modelling element
        
        actions
        
        control flow
        
        object flow
        
        decision node
      - Syntax/Semantics
      - Concurrent flow
      - partitions
    - - complete, uninterrupted sequence of actions of an actor with the system giving a result of added value
      - always started by an actor
      - activating actor have a business goal that he want to go through
      - always described and named from the viewpoint of the actor
      - step
        
        recognize & define the system boundary
        
        identify actors
        
        identifying use cases
        
        specify use cases
        
        construct a case document
        
        describing scenarios
      - system boundary
        
        actor are always outside
        
        the system cant be the actor to itself
        
        name of the system should be provided
      - pre and post conditions
        
        pre and post condition are restrictions
        
        preconditions must have been fulfilled before the Use Cases starts
        
        post-conditions must be fulfilled if the Use Case ran successfully
        
        if no restriction given, this is also to be documented
      - Scenarios
      - Relatioship