Abstract: Exactness in software cost and effort estimation is tedious task in software development. Too many variables-human, technical, environmental and political-can affect the ultimate cost of software and effort applied to develop it. However, software project estimation can be transformed from a black art to a series of systematic steps that provide estimates with acceptable risk. Four module assignment factors, team size, concurrency, intensity and fragmentation were identified as potentially significant determinants of software development effort. This system is the generalized system, which can be used in any type of software development industry. The system has been developed for software development industry to reduce the scheduling effort for developing software. The results of the study indicate the work assignment factors (team size and concurrency) can be used to improve the predictive ability of effort estimation.