University of Southern California Center for Software Engineering C S E USC 05/25/06 © USC-CSE 21 1970's: Problems with Waterfall Model Overly literal interpretation of sequential milestones –Prototyping is coding before Critical Design Review –Mismatch to user-intensive systems Heavyweight documentation hard to review, maintain –7 year project with 318% requirements change –Milestones passed but not validated Mismatch to COTS, reuse, legacy SW –Bottom-up vs.
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