DoD Ch. 9

     Chapter nine deals with user models and who really puts in the effort in the beginning of a design. Then Brooks talks about team design and the use of models in complex design and how several factors play into design models.  He goes on to talk about how sometimes facts about a product aren't known until the design is underway or almost finished.  This is why we "guess" or "postulate" attributes of design.  This assumptions will have to be defined in the end by the chief designer.  Brooks concludes the chapter by saying that more definite assumptions are better than vague assumptions.