Begins with a complete description of the job that the computer is to perform. This job description is obtained from the person for whom the program is being prepared, such as a business man ager or an engineer. It explains what input data are needed, what computing must be done, and what the output should be. Computer programmers use the description to prepare diagrams and other pictorial aids that represent the steps needed to complete the task. The programmers may produce a diagram called a system flow chart that shows how all the major parts of the job fit together systematically . After a computer program is written, it is tested on the computer for mistakes. Computer refer to mistakes in programs as "bugs" and the testing of programs as "debugging".
A program generally is entered into a computer in what is known as an interactive environment. In such an environment, the programmer enters part of the program on a computer terminal. The computer's operating system responds immediately, telling the programmer how the computer will interpret each instruction. The programmer then can analyze each response. Programs that result from this interaction between the programmer and the computer generally are stored on some type of file storage device until needed.
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