This document is a chapter from a book about data quality and data governance. The chapter discusses how poor or incorrect data can lead to significant financial losses for businesses. It provides examples where small data errors resulted in large consequences, such as a $327 million satellite project failure due to a mix-up between metric and imperial units. The chapter emphasizes that maintaining high quality data in areas like procurement can help businesses reduce costs by 10% or more by enabling strategic sourcing. It also notes that identifying and resolving duplicate records is important but complex.