A lesson I did for year 12 politics looking at pressure groups at the end of the unit. It features a sample answer with a generic mark scheme which is tailored for the Edexcel spec, but could easily be modified for other boards. It is based around the Blooms Game. Pupils work in pairs/threes working their way up the Blooms board on the whiteboard, with team names on post it notes. The questions are cut up on to individual slips and teams can only progress when they have produced a good enough answer that you mark. It gets really competitive and is a lot of fun...and best of all the pupils do a lot of work without really noticing!