IN4MATX 43 Lecture Notes - Lecture 3: Waterfall Model, Failure Cause, Hard Disk Drive
Document Summary
Payroll system: 160 state departments, 40+ medical/dental plans, million in costs. Software must conform to the reality of payroll contracts, laws, billing policies. Part of the goal is to update systems in place since the 1970s. Requirements = what the software should do (without saying how it should do it) 31% of projects cancelled before they are even completed. Billions wasted per year on cancelled, unused or unusable projects. 52. 7% of projects were more than 189% over budget when delivered. They represent more than 70% of rework costs. Rework consumes about 30-50% of total project budget. Lack of user input/user involvement listed as most frequent problem. Cost of maintenance is the highest and most time-consuming. Requirements address what a customer needs, not wants. Requirements specification can also refer to the requirements document. Serves as the fundamental reference point between customer and software producer. A requirements specification is the source for all future steps in teh softwre life cycle.
