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Pre-Condition vs Alternative Flow

 
Lars Nielsen
Greenhorn
Posts: 2
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The Pay for Itinerary use case specification describes an alternative flow that is performed if the user does not satisfy a requirement.

Main flow:
1. User does something.
2. [constraint] system does something.
3. User does something.

If !constraint:
1. system does something new before the original something. (this copyright law makes it difficult to ask a simple question)


Later in the specification a pre-condition states that the user must satisfy this requirement. So why is the [constraint] there in the first place? The pre-condition states that the user satisfy this constraint.

Lars
 
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