Not specifically related to CTC, but this is what I was taught on our management communications course at work.
1. Try to write down about 5 bullet points in response to the question.
2. Decide what you want to say and say it. Make the answer make sense (rather than just a list of points) by connecting the points in a natural way, re-ordering them if need be.
3. Sum up in one sentence at the end that highlights your main point and relates it back to the question so that the reader gets the main points you are making subtly reiterated.
Hope this helps