Also in longer documents, it is often a good idea to abide by the old saw of beginning paragraphs with topic sentences as this also facilitates scanning. Listing can make information more accessible. Use underlining, boldface, and italics for emphasis, but don't overuse. And remember to make headings parallel. Headings make it easier for your reader get oriented and to move around in the document.
Information is more accessible because the readers know what section they are in, what to expect.
Also the information may be more retrieveable because it's easier to return to certain sections.