I was given a great reading around collaboration. Using the rubric on this site made me realise I was controlling too much of the planning when my students were collaborating. We carried out a science investigation and I encouraged groups to visualise the experiment and plan for the different jobs that would need to be completed. Here is the doc...
We also happened to have our assembly in the same week so I threw all of the planning and organising to the class and they collaborated to complete five different (but cohesive) items with minimal planning from me. Here are our slides...
