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Here’s something I’d never thought of: doing a usability study on an API.

Two videos were posted to Channel 9 earlier in the week that show an intro & an actual usability study lab.  Here’s the kicker: the lab participant isn’t allowed to use VS .NET, intellisense, help, or the workflow designer… they can only use notepad! Why? Because if the WinFX/WWF team built a killer designer/intellisense/help system, it could be because he API flat out sucked.  What you want is a tight API and provide a designer and help system that will let you work with the API in a much more productive setting (IMHO at least).

From the C9 post:

This was an API usability lab where the lab participant was responsible for building a workflow application and providing feedback on the APIs.   In the first part of this video, James Conard the evangelist for Windows Workflow Foundation, has a brief chat with several of the people involved in this usability study.  In part 2 of this video, you will see the participant (Michael) actually writing the code to use WF and talk about his experience.

The videos:» Windows Workflow Foundation API Usability Lab Video – Part 1» Windows Workflow Foundation API Usability Lab Video – Part 2

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