Writing
The way in which ideas are presented on paper is important, not only in articulating ideas, but also in giving insights into practice and the thinking behind the work.
Give yourself time to prepare a proposal. Structure your proposal based on what is required. Clarity is key to communicating your ideas quickly. The opening statement and paragraph is important. Generally it is good to keep sentences and paragraphs short.
Keep in mind that there may be quite a few people reading your proposal all with different expertise and knowledge. Work at helping to maintain a quick sense of flow to your text, considering how you will allow space for articulating further or explaining complex ideas.
Always get someone, preferably a peer, to read and look through your proposal. Remember writing is a process - ideas come through this process. Clarity emerges when you write and structure your thoughts. Always leave time for editing and fine tuning.