I'm not sure how to deal with the following issue - let me first put some more background/context for better understanding.
There is a point 2. of the assignment which describes some deliverables or in other words describes things which system should do - conclusion of BusinessPeople meeting - the features which system should provide.
Some of the 7 sub-points are quite clear, covered by use-cases.
But some of the sub-points have quite poor explanation, like: the system should allow to the users to assign/change their 'discount plan'. There isn't any point/entity which refers to 'discount plan' in the business domain diagram. Moreover, there is no mention about the 'discount plan' in the use-case diagram. Furthermore, all the discount and money related operation are proceed in a remote system which is out of the scope of the assignment.
Should I either extend the business domain model about stuff related to 'discount plan' or shouldn't treat seriously the information described at point 2. and fulfill only the requirements covered in the use-case diagram ?
*) of course the 'discount plan' is an artificial example
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