Here is an interesting approach to a teachers workshop on the theme of Demand High. It took place on Friday 23rd November 2012, and comes from Diana England, Director of Studies at International House, Torres Vedras, Portugal. She designed and ran the session, and all the materials you need are here, but feel free to adapt.
What follows are:
1.. Her overview of her setting
2. Her session notes
3. The ppt she used
4. The collated participant results.
Note how Diana uses a 3 x 7 grid to tease out differences between too difficult, under-challenging, and doable demand, and in the other dimensions she has the four skills and the three language systems. See also how the ppt illustrates and sets up the tasks
We find this a useful thinking device and a great resource.