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Software development life cycle or SDLC for short is a methodology fordesigning, building, and maintaining information and industrial systems. Sofar, there exist many SDLC models, one of which is the Waterfall model whichcomprises five phases to be completed sequentially in order to develop asoftware solution. However, SDLC of software systems has always encounteredproblems and limitations that resulted in significant budget overruns, late orsuspended deliveries, and dissatisfied clients. The major reason for thesedeficiencies is that project directors are not wisely assigning the requirednumber of workers and resources on the various activities of the SDLC.Consequently, some SDLC phases with insufficient resources may be delayed;while, others with excess resources may be idled, leading to a bottleneckbetween the arrival and delivery of projects and to a failure in delivering anoperational product on time and within budget. This paper proposes a simulationmodel for the Waterfall development process using the Simphony.NET simulationtool whose role is to assist project managers in determining how to achieve themaximum productivity with the minimum number of expenses, workers, and hours.It helps maximizing the utilization of development processes by keeping allemployees and resources busy all the time to keep pace with the arrival ofprojects and to decrease waste and idle time. As future work, other SDLC modelssuch as spiral and incremental are to be simulated, giving project executivesthe choice to use a diversity of software development methodologies.

A Simulation Model for the Waterfall Software Development Life Cycle