Typically, from a set of features, various program techniques may also be generated that share common features and differ in other aspects. The set of program techniques generated from a set of points also is known as a application product line . FOSD aims almost at three homes: structure, reuse, and adaptation. Developers use laptop technological know-how help concept of a feature programming help constitution layout and code of a program device, features are computing device science help basic units of reuse in FOSD, and computing device technological know-how help editions of a software device vary in computing device technological know-how help features they deliver. FOSD shares goals with other program development paradigms, such as stepwise and incremental application advancement , aspect orientated application development , component based software engineering , and various flavors of program product line engineering , whose variations programming help FOSD we’re going to discuss. Historically, FOSD has emerged from diverse lines of analysis in programming languages, application structure, and modeling.