Preface

With over 200,000 apps in the App Store, it has become increasingly challenging for app designers and developers to differentiate their apps. The days are long gone when it was possible to crank out an app over the weekend and refine it after receiving a few not-so-flattering user reviews. Users now have choices—lots of them. If your app is difficult to use or doesn’t meet their needs, finding another one is just a tap away.

To illustrate, consider the ever-growing field of Twitter clients. There are hundreds of variations in the App Store, but only a handful stand out from the pack (such as Tweetie and Twitterific). For most apps, it boils down to one thing: the user experience. The same is true for countless other categories within ...

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