As he explains on the plugin page:

The plugin follows the HMI structure of Investigations and Challenges.  An investigation starts with someone asking a question. The questioner can then set a number of challenges to help them and the community answer the question and share the results.

You may, for example, ask What is the average cost of a pint of bitter?. A good challenge may be to ask participents in the investgation to find the price of bitter in their local pub. But you could also set a challenge to map the information and publish it on google maps. 

If you want to develop the plugin further let Andy know. You can read more about the plugin and the background to it on his blog post.

Likewise, if you decide to use the plugin on your site, let us know – we’d love to hear what you do with it.