July 2008

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What is A Bug ?
A bug in a computer program is simply a mistake or oversight in that program, made by the person who wrote that program. A bug will stop the computer program from working correctly under certain circumstances. Bugs can occur in any program and even in Windows itself. Sometimes a bug will crash or hang the computer and other times the bug will simply stop one operation from working correctly.

Bugs generally occur when the programmer has not been able to predict every combination of circumstances which can occur when the program is being used. When an unpredicted combination of circumstances arises in normal use, the program is unable to resolve the correct action to take, and the bug manifests itself.

In addition to this a bug can often occur when part of a program is changed to make it perform extra additional tasks that were not predicted when the program was first written. In this instance the original part of the program may not be able to cope with the extra data or tasks which have arisen out of the changes to the program because these extras were not allowed when the program was first written.

Fixing Bugs
Bugs are fixed by examining the circumstances which caused the problem and ensuring that the program can cope with these (and all other) circumstances. Most bugs are easy to fix once the circumstances are known.

A bug can be a trivial mistake which can be easily avoided once it is known about and documented, or a serious problem which prevents a program from operating correctly.