Mind maps are great for many things (and obviously, for CLIL as well!). Children -and adults- learn, and can study better when writing all the main ideas about a topic on a mind map.
As Tony Buzan mentioned: a Mind Map is a powerful graphic technique which provides a universal key to unlock the potential of the brain. It harnesses the full range of cortical skills – word, image, number, logic, rhythm, colour and spatial awareness – in a single, uniquely powerful manner. In so doing, it gives you the freedom to roam the infinite expanses of your brain. The Mind Map can be applied to every aspect of life where improved learning and clearer thinking will enhance human performance.
More info: http://www.buzanworld.com/Mind_Maps.htm