Could anyone guide me through this as approximately how many pages the assumptions and related explanations could be?
The assumptions shold not be numbered i pages.
I will give some examples of reasonable assumptions as I understood the term:
A rich client will, all other things equal, perform better than a web client. Therefore, a Swing application will be developed for use by agents.With the chosen technology, a web client will perform practically as good as a rich client. Therefore, agents and customers can use the same application. The two assumptions above leads to two completely different conclusions - the first one will explain why one needs to develop a separate application for the agents to use, the second one explains why this is not neccesary.
In my assignment (score: 88p) I had five assignments along these lines.
All in all, you do NOT need to write a lot of words. I started with a short Summary (ca 50-60 words), five assumptions as above, a short (10-15 words) intro to each section for the various diagrams, and a short list of which technology used for which part of the solution. I had 4 notes inside the class diagram, each containing no more than 10 words. And that was all the writing I did.
Keep it short, simple and to the point.