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The problem is that there is often confusion surrounding the differences in focus and content between the two documents. Most people have an internal non-documented “System Concept” in their mind as they formulate, write, or review product requirements that are typically the source of disagreement. Life cycle processes.
However, even Dr. Winston Royce who documented the initial Waterfall process in his 1970 paper recognized the limitations in this process. 2012 – Disciplined Agile Delivery. The primary emphasis of “Waterfall” was to try to bring some level of control and predicatbility over project costs and schedules.
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