The 60 posture sequence we follow was developed by Master Chen, when he left his master, Cheng, Man-Ching.  The book spells out his methodology and is expert testimony to tai chi.

Another reader’s review via Amazon.com:

A Master’s Mechanics
This book delivers what the many slickly produced Tai Chi books claim to, it simply explains the mechanical aspect of Tai Chi. The author provides a clear explanation of his short form, his theories and his own life experiences. A must for anyone interested in learning the perspective of a martial arts master.