David Verba has written a great article about the use of prototyping in developing web applications on A List Part. Having been developing prototypes for the past 12 years, it is always great to see this topic brought to the forefront.
In the article he talks about the fact that “Prototyping is the magic”, a fact that I recently witnessed on project. We were building a prototype of the new website. The main purpose of the site was to conduct some usability studies of the purchase process (it was a web to mobile site). Since I was able to get a nice functioning site up with some Flash components in it, the client really understood what this was all for.