Costly playgrounds boring kids: UBC | Vancouver 24 hrs
Love this article and study, again from Canada, into activity levels derived from child directed play and the 7 C's that should be inherent in each playspace, i.e. character, context, connectivity, change, chance, clarity, and challenge.
I particularly like the diagrams which provide conclusive examples of how current licensing laws under calculate the area that children require to play. Coincidentally child space calculations in Australia are the same as those in BC i.e. 7m2.
The article can be read from the hyperlink above and the full study, which is bloody good reading, can be found here http://wstcoast.org/playspaces/outsidecriteria/7Cs.pdf