The knowledge of intuition has made significant advances in recent years. I have always trusted my intuition in playing draughts, business, and history. I developed a hypothesis and later had to confess that intuition is not enough to predict or assess all implications of including or excluding certain elements or relations. Although some of the ideas ended up to be wrong, others are now confirmed by the JGAAP program. JGAAP is a very helpful program, but using it is not enough to be sure that the results are 100% reliable. For that reason we need additional proofs, such as studies by other researchers and certain words frequently used by the author. In essence, the goal of this book is to provide a toolbox from which researchers can draw certain conclusions about the possible authors of La Celestina.