Conclusion
We've discussed many user-interface building techniques in this chapter; all of them implemented using Excel's built-in features. However, don't lose sight of the fact that the most important thing about an Excel user interface is not how many cool techniques you've used. Users don't care about cool techniques. They want an intuitive user interface that makes it easy for them to get their job done. Ideally your user interface should not draw attention to itself at all. It should just be so well designed and constructed that users can dive right in and start working without having to spend any significant time figuring things out. Adhering to the eight principles described at the beginning of this chapter can help you design user interfaces that do their job so well no one notices them. This is the best user interface design of all.

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