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This article is attributed to GeeksforGeeks.org. It is a procedural cost estimate model for software projects and often used as a process of reliably predicting the various parameters associated with making a project such as size, effort, cost, time and quality. Program is a set of instruction related each other where as Software Product is a collection of program designed for specific task. Pareto Principle to software testing state that 80% of software … By using our site, you consent to our Cookies Policy. Reverse engineering is also useful in software testing, it helps the testers to study the virus and other malware code . Software Engineering is the application of engineering concepts, techniques and methods to the development of mission-critical software systems. Software is a program or set of programs containing instructions which provide desired functionality . 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