In order to do a good computer program there are different phases of development to respect :
Problem Solving Phase
Analysis and Specification : understand (define) the problem and what the solution must do.
Algorithm Development : develop a comprehensive unambiguous logical sequence of steps to solve the problem.
Verification of Algorithm : follow steps closely (manually) to see if solution works.
Implementation Phase
Program Development : translate algorithm into a program written in a programming language.
Program Testing : test program for syntactical and logical errors. Fix the errors.
Maintenance Phase
Use : use the program to solve real world problems.
Maintain : modify the program to meet changing r
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