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Some guide line for Testing a software: Type of Testing: acceptance, conformance(conformity), usability, performance, relibability,rebustness. 1.understanding     software behavior(fault model)     software environment     Testing for input, output and compuation. 2.Some Rules: Rule 1:Apply inputs that force all error messages to occur (implement input filter,checking exception..) Rule 2:Apply inputs that force software to establish default values. Rule 3:Explor allowable character sets and data types Rule 4:Overflow input buffer check. Rule 5:Find inputs that may interact and test combination of their values Rule 6:Repeat the same or seriser of inputs numerous times. Rule 7:Force different output to be generated for each input.