This document discusses improving data quality for marketing effectiveness. Typical data problems include duplicate records, incomplete data, and incorrect data. Marketing benefits from quality data through having an accurate view of customers to effectively target communications. The best way to address data quality is as close to the source as possible, such as validating data during web form submissions. Various opportunities for cleansing data exist, such as during transactional updates, from external data feeds, when migrating legacy data, and through regular maintenance of existing data. Ensuring high quality data is important for marketing success.