One might think that separate into two volumes his method allows to give more revenue to the author. This is obviously the case. But it is also a very good thing. Commmencer with the first tome without indications of this Volume 2 is the best. In order to focus specifically on the basis of the method described in Volume 1. Once accustomed, Volume 2 arrives wisely. It is to buy when we achieved the objectives of 4th level in my opinion.