Software systems are ubiquitous in every emerging application. Software Engineering aims at delivering high quality software in order to sustain total customer satisfaction. This is achievable by developing the software within stipulated resources and constraints such as time, cost etc. Hence, project manager equipped with advanced project management skills plays a vital role during software development process to achieve project success. This paper presents a case study of three leading software industries which follows agile and perspective approaches for their software development process. Since, it is a well proven fact that scope creep is one of the significant project influencing parameter, the aim of this investigation carried out on several projects indicates that scope creep is highly influencing other project success modulation factors such as cost, time and henceforth the quality of software whenever projects are developed using traditional models. However, there is negligible impact of scope creep on projects that are developed using agile approach. This awareness of influence of scope creep on projects developed using various models ensures the project manager to effectively manage the project.
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