  Book sales in Spain have fallen progressively, which requires urgent changes
to optimize the sales process as much as possible. This research proposes a new
system, called Base of Reasoning in Artificial Intelligence with Natural
Language (BRAIN L) focused exclusively on the publishing industry. The new
field of knowledge of Artificial Intelligence (AI), Natural Language Processing
(NLP), tecnolog\'ia del Machine Learning is combined with Case-Based Reasoning
(CBR) techniques for book recommendations. A model is developed to retrieve
similar cases/books supported by NLP techniques for decision making. In
addition, policies are implemented to keep the model evaluated by expert
reviews, where the system not only learns with new cases, but these cases are
real.
