In most organisations, there can be some metrics and terms that are shared across the organisation. Sometimes each department's understanding of the metric and the term aligns. Unfortunately, a lot of the time differing variations will exist, hiding in the footnotes of slide decks, described lengthily in archived documents, contained and commented within a particular SQL query, or encoded in the actual contents of a field in the database.This creates so much work, rework, hedging, distrust and confusion.
This book makes it so very clear about how to resolve this. He gives a great conceptual understanding of the problem, of the resolution and a very clear process for how to get consensus on a term, data point etc, and how to future proof it against business changes that might otherwise distort the original consensus.