RE: [ba-ohs-talk] Solving complex problems - Requirements and Constraints
Dennis E. Hamilton wrote: (01)
> Do you know somewhere that has "requirements and constraints" laid out in
> more detail? I want to raise my competence in that area. (02)
Not that I can put my hands on immediately. (03)
A requirement is something a system must do or not do, e.g.: The system
shall support Unicode file names.
A constraint is something the system has to live with, e.g.: Files are
limited to 2GB in size.
Other constraints are added as derived requirements during design and
implementation. In "Design by Contract" there are pre-conditions,
post-conditions, and invariants. These are all constraints that arise
because of the design or implementation, e.g.: Topic names are limited to 55
Garold (Gary) L. Johnson (06)