JOINT EDITION is about accompanying the author in the steps of review, correction and also of support in the promotion, distribution and sale of the book. It is a process contrary to that of self-publishing in which the author is alone. The publisher puts in the case of joint edition qualified personnel to thoroughly degreas the work, obtaining at least the following : 1 . Features of the work2 . Structure3 . Strengths4. Weaknesses to improve. Description if there is a point that gaga the non-editable work. 5 . Correction suggestions ( Style Corrections , Spelling, or Integral ). 6 . Objective text quality7 . Personal opinion on the text Libreries tend to reject self-edited books because they are generally of lower quality and low sale