The estimating software development cost remains a complex problem, one that continues to attract a considerable amount of research attention. Improving the accuracy of the cost estimation models available to project managers would facilitate a more effective control of time and budgets during the software development. The needs for reliable and accurate cost estimation in software engineering have been an ongoing challenge for software engineers in the last decade. Software cost estimation is the process of predicting the effort required to develop a software system. The basic input for the software cost estimation is coding size and set of cost drivers; the output is effort in terms of person-months.