I’ve spent years running ‘blue sky thinking’ workshops. Where anything goes. Where every idea is a good idea. I now realise that this is a waste of time. Firstly, people find it difficult to come up with ideas when there are no boundaries. Secondly, in the post-workshop review, the ideas are impossible to implement. No wonder ‘brainstorming’ workshops have got a bad reputation.

Instead, I would recommend the opposite. I like to call it ‘black sky’ thinking. It involves setting up the workshop completely differently. Here’s what to focus on.