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copied!<p>You don't necessarily have to spend 20% of your time fixing bugs litteraly, but - yes - most programmers have to face the problem of bug fixing. Hopefully you'll be able to spend less than 20% on your time bug fixing, if you're not careful it might even take more of your time. </p> <p>No matter how good a programmer you are it is highly likely that you'll introduce a few bugs at some time. If you're diciplined with <a href="http://en.wikipedia.org/wiki/Unit_testing" rel="nofollow noreferrer">unit testing</a> you can hopefully avoid bugs best possible. I highly recommend you to look into <a href="http://en.wikipedia.org/wiki/Test-driven_development" rel="nofollow noreferrer">Test Driven Development</a> (TDD) if you want to do your best for avoiding bugs. </p> <p>There are several questions about unit testing and TDD on StackOverflow if you need help getting started. Here are a few of them: </p> <ul> <li><a href="https://stackoverflow.com/questions/67299/is-unit-testing-worth-the-effort">Is unit testing worth the effort</a></li> <li><a href="https://stackoverflow.com/questions/1742323/tdd-vs-unit-testing">TDD vs Unit Testing</a></li> <li><a href="https://stackoverflow.com/questions/1365943/how-to-start-unit-testing-or-tdd">How to start unit testing or TDD</a></li> <li><a href="https://stackoverflow.com/questions/917334/should-i-use-tdd">Should I use TDD?</a> </li> <li><a href="https://stackoverflow.com/questions/1195230/getting-started-with-tdd">Getting started with TDD</a></li> <li><a href="https://stackoverflow.com/questions/163454/getting-started-with-tdd-interfaces-and-mockups">Getting started with TDD, interfaces and Mockups</a></li> </ul>

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