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This is a bit speculative, and undoubtedly my own thoughts on the issue.

What Are we Building for Engage Mobile?

Scenarios for Deploying Engage

Thoughts on Supporting Multiple Devices

iPhone and the Others

The iPhone's user interface conventions are extremely well-established and supported by their Human Interface Guidelines. With this, users tend to bring a fairly firm mental model of how the user interface should work. They expect to use certain gestures, they expect consistent layout and navigation, and so on. Failure to conform to this mental model, at least in the case of downloaded apps, will inevitably cause frustration and disappointment.

The other platforms, particularly Android and Symbian, provide little in the way of established conventions and consistency of interaction across applications. Put another way, there is no solid user mental model about how an app should work with. This is acutely the case with Symbian, where even portions of the OS behave differently than others. Symbian and Android users expect diversity and inconsistency. I still don't have a good sense of Blackberry as a platform, or the expectations its users bring to it.

Another thing to point out is the fairly small number of apps running on the non-iPhone platforms at this point. Undoubtedly, app development is picking up speed on all platforms, but iPhone has the largest base. As a result, many apps are being ported from iPhone to the other platforms, bringing with them the idioms and conventions of the iPhone. I suspect that most Android or Symbian users don't find this particularly disconcerting.

On the other hand, the Web brings with it a different set of expectations and conventions, even on the iPhone.

The Web as Platform

Examples of Webbish Mobile Web Apps

Try these on your mobile device or in Safari:

The Technical Context

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