[Trac #747] Calculate activity

[Zarro Boogs per Child]

#747: Calculate activity
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 Reporter:  marco             |       Owner:  Eben   
     Type:  defect            |      Status:  new    
 Priority:  normal            |   Milestone:  BTest-3
Component:  interface-design  |    Keywords:         
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 If we can get mockups or even a description of how this should look, this
 sounds like something we can get as an external contribution.

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Ticket URL: <http://dev.laptop.org/ticket/747>
One Laptop Per Child <http://laptop.org/>