Specification Starter task

I was recently observed and needed a quick and effective starter task to engage my learners. The topic was 'Writing a specification' as we were making mobile phone holders I decided to create a group work task where learners had to discuss and decide what the designer was thinking when he/she designed products. Each group had a different Phone holder to look at and then had to discuss their findings on the whiteboard. I found this was highly effective in getting learners to understand the purpose of a design specification.