Little heading The diaphragm is translucent. Guidelines Especially if time is short, concentrate on the first page or even the first paragraph. Make sure, too, that the last paragraph is worth reading. Many people will initially read only the first and last paragraphs. Give a summary.
Readability Make sub-headings short, active and interesting.
Know your target readership. The material should be accessible to all, without seeming to patronise the more knowledgeable. For wordprocessed text, a readability measure can help you see whether you are pitching correctly. Beware of long sentences. Anything over 40 words should survive only if it is truly excellent.