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The source code should be commented and documented so well, that the customer easily can make modifications and build on your work after the project is finished.
At the end of your project, the source code and necessary resources should be included on the CD/DVD attached to the project report, supplemented referenced and supplemented with a Readme.txt file.
Code Review
Code Review, or Peer Code Review, is the act of consciously and systematically convening with one's fellow programmer to check each other's code for mistakes, and has been repeatly shown to accelerate and stramline the process of software development like few other practices can. There are some crucial insights about the code review from the book Best-Kept Secrets of Peer Code Review, which is about Cisco's peer-code review process condected by SmartBear team:
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