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Generally speaking, there are bugs in software because of unclear requirements, software complexity, programming errors, changes in requirements, errors made in bug tracking, time pressure, poorly documented code and/or bugs in tools used in software development. - There are unclear software requirements because there is miscommunication as to what the software should or shouldn't do.
- Software complexity. All of the followings contribute to the exponential growth in software and system complexity: Windows interfaces, client-server and distributed applications, data communications, enormous relational databases and the sheer size of applications.
- Programming errors occur because programmers and software engineers, like everyone else, can make mistakes.
- As to changing requirements, in some fast-changing business environments, continuously modified requirements are a fact of life. Sometimes customers do not understand the effects of changes, or understand them but request them anyway. And the changes require redesign of the software, rescheduling of resources and some of the work already completed have to be redone or discarded and hardware requirements can be effected, too
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