●Ravi, like many project (71) ,had studied the waterfall model of software development as the primary software life-cycle (72) ．He was all set to use it for an upcoming project, his first assignment． However, Ravi found that the waterfall model could not be used because the customer wanted the software delivered in stages, something that implied that the system had to be delivered and built in (73) and not as (74) ．customers managers users administrators(72)

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