Leading (pronounced “ledding”) is the typographer’s word for line spacing, named for the lead shims that were once inserted between rows of typeset characters. Possibly, you have played with the controls in your word processor and seen how text looks with single or double line spacing selected? Manuscripts are generally created double-spaced, not only so editors have a place to write comments above the text, but because they’re easier to read that way. Convention suggests a leading value of 50%—that’s 50% larger than ( times the size of) your chosen typeface. In other words, if you’re using 12-point type, start with 18 point leading. From there, make fine adjustments to account for the typeface itself. I like to set a full block of text with my selected typeface and type size, then expand the leading so the last line sits perfectly on the bottom of the text box.