Testing and programming are two different professions, we would like to present in the following lines the fundamentals of the two activities to justify the necessity of testers doing testing work.

The very nature of testing is to find faults in software, a destructive process. A tester is concerned if the system does what the user wants, is reliable and doesn’t do things it shouldn’t. He will spend long hours looking for faults in the software but in destructive way. In a tester’s mind the dominant idea is that “a software always has errors and they must be found”. Testers are looking at the software from the customer’s perspective.

A developer, as any other person, is sentimentally attached to his work and by empathy to his / her colleagues work therefore is most likely that he will not find defects in his own work.

A tester’s job is to find faults by any methods at his disposal while a developer’s task is to complete the system which cannot be done until all faults are identified and remedied. Thus we have two different roles that complete each other.

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