This outspoken booklet aims at serving as a practical guide for those interested in medieval Latin texts, and in particular their editing techniques. Far from dealing with general theories and theoretical principles, its aim is to assist in gaining experience and in making the best use of scant resources by signalling pitfalls and suggesting methodologies. Examples are mostly taken from the writer's own editions, several of which have appeared in the Corpus Christianorum Continuatio Mediaevalis. In spite of its modest size, Ars edendi deals with the numerous problems editors find themselves confronted with, and reflects the experience its author has accumulated in over forty years in the field.