This is the third of a 10-part series of the Ten Keys to Seamless Typesetting. Kerning is a necessary part of the typesetting process. Whereas in the past this could have meant filing the edge of a sort to fit two characters closer together, today the process is much faster. To a large extent, kerning is pre-programmed into a professional font, but not every letter combination is necessarily taken care of and even if it is, not necessarily to the liking of the typesetter.