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Software development process have been improving continuously and process improvement is growing concern for successful delivery of the product. Productivity, efficiency, quality and fit for purpose are major factors considered in software development. Different models based on CMMI, that software companies are using to improve the software process improvement activities are discussed in this article. Software companies are resistant to adopt improved models and methods due to various reasons such as complex structures. Project managers can understand and control the quality of the software and very closely by implementing CMMI model. In order to increase the maturity of the software development process, this study defines the major process areas for software projects and offers implementation strategies in the form of key activities.