We have just handed in our thesis proposals. While writing it, we came across an interesting and helpful document from the European Commission on writing clearly. It can be found here.
It is especially handy to check whether you have not used unnecessary words or sentences and if you are really writing what you mean. A lot of times us lawyers-to-be tend to write in long sentences with complicated structures. This document helps you identify this problem and overcome it. It is much easier for a person who has not written the article or, in this case, thesis to read short sentences.