to produce new editions of the NA and UBS. The nature of that revision brings us to the topic of this book: the Coherence-Based Genealogical Method, or CBGM. The current volumes of the ECM, and with them the UBS5 and the NA28 have been revised using the CBGM. This book is designed to introduce you to the CBGM. So, what exactly is the CBGM? Answering that will require the remaining chapters of the book. But, in a relatively short sentence, the CBGM is a method that (1) uses
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