Agile software development has received much attention in software development community because it promotes fast development of software product. On the basis of our literature review, we have identified certain limitation of agile methods, i.e., there is no proper documentation, poor quality software due to fast development etc. Adaptive software development process (ASDP) model is modified approach of extreme programming (XP) which includes communication and planning; analysis; design and development; and testing and deployment. There are four control variables in XP like cost, time, quality, and scope. This paper presents an extended version of ASDP model by integrating the esrcTool for the computation of cost of each requirement. Finally, we identifY the research issues for