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Deviating from the flow in the use case, is that ok?

 
Calen Legaspi
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I think the application will be better if I deviate from the sequence specified by some of the use cases. For example, to me it seems checking for whether a user is logged in and has a valid profile seems too late in the game, and perhaps it would be better if authentication happens even before each use case occurs. In fact, being logged in is a precondition to most of the use cases, so it seems some use cases have some inconsistencies.

Is it ok if my sequence diagrams deviate from the stipulated work flow? These deviations will be well-documented, of course.
 
Dhiren Joshi
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I wouldnt recommend it.
This is one of the major pre conditions and it determines your architecture.
How u intend to have a reservation cart even though having no registred users etc.
If u deviate from this u deviate from the requirements.
Thats my 2 cents. I am not SCEA yet so you could search the forum for your answers.
HTH
Dhiren
 
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