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While developing the software systems, it is often needed to make modifications in earlier development phases or the tasks sets. If the development process is linear or in a straight line from requirements gathering to deployment then the end product will be unrealistic. In such cases, the iterative approach needs to be adopted. The evolutionary process model is iterative model . Prototyping  In prototyping model initially the requirement gathering is done. Developer and customer define overall objectives; identify areas needing more requirement gathering.   Then a quick design is prepared. This design represents what will be visible to user in input and output format. From the quick design a prototype is prepared. Customer or user evaluates the prototype in order to refine the requirements. Iterative prototype is tuned for satisfying customer requirements. Thus prototype is important to identify the software requirement. When working prototype is built, developer use

In this model, the initial model with limited functionality is created for user's understanding about the software product and the this model is refined and expanded in later releases. Incremental Model:  The incremental model has same phase that are in water model. But it is iterative in nature. The incremental model has following phases. Analysis Design Code Test The incremental model delivers series of releases to the customer. These releases are called increments . More and more functionality is associated with each increment. The first increment is called core product . In this release the basic requirements are implemented and then in subsequent increments new requirements are added.  The word processing software package can be considered as an example of incremental model.In the first increment only the document processing facilities are available. In the second increment, more sophisticated document producing and processing facilities, file management fu

Definition of process model : The process model can be defined as the abstract representation of process.The appropriate process model can be chosen base on abstract representation of process. The software process model is also known as software Development Life Cycle model or Software paradigm. These models are called prescriptive process models because they are following some rules for correct usage In this model various activities are carried out in some specific sequence to make the desired software product. Various prescriptive process models are waterfall model, Incremental process model and Evolutionary Process model.  Need for Process Model: The Software development team must decide the process model that is to be used for software product development and then the entire team must adhere to it.This is necessary because the software product development can then be done systematically.Each team member will understand - what is the next activity and how t

Software Engineering In Software Process and Project Management Introduction: Today,Software Engineering is the most important technology with rapid development.National economy is also depend on this technology,Day by day more and more systems are getting controlled by software.Hence it becomes necessary to understand the software development as an engineering discipline.This chapter is for understanding fundamental concepts.We will get introduced with software engineering by understanding what exactly mean by software,what are the objectives of software engineering,In this chapter,we will also discuss various categories of software.Finally we will discuss various challenges in software engineering. Introduction to Software Engineering: In software engineering the systematic and organized approach is adopted.Based on the nature of the problem and development constraints various tools techniques are applied in order to develop quality software. The definition of sof