Engineering, 15.02.2021 20:00, sleepyflower10

... is an actual sequence of interactions (i. e., an instance) describing one specific situation; a ... is a general sequence of interactions (i. e., a class) describing all possible ... associated with a situation. ... are used as examples and for clarifying details with the client. ... are used as complete descriptions to specify a user task or a set of related system features.

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... is an actual sequence of interactions (i. e., an instance) describing one specific situation; a...