Once again I want to rant but realise this video emphasizes that we are doing it wrong.

We need much more structure to  co-operative learning,so that all students have their say e.g turns, everyone researches and reports back for a collaborative answer.

where all group members learn about the task, not divided jobs so students only know one section of the task

I agree that group work strategies have to be taught for students to succeed. We seem to expect them just to get on with it, with little input of how to get it done in a group.