This document discusses spaces in formal documents. It defines three types of spaces: space between words, spacing between paragraphs, and margins between text and the paper edges. It provides guidelines for formatting a professional letter, including double spacing throughout, triple spacing before the closing, and five spaces before the signature. The top and bottom margins can be adjusted to balance the text on the page, with less space at the bottom for longer letters. Paragraph spacing can be single, 1.5, or double spaced.