Data quality management is crucial for ensuring accuracy and usability of data, especially at scale, as highlighted by the challenges faced by companies like Lyft, Shopify, and Thumbtack. Lyft addressed data quality issues by creating Verity, a proprietary tool that conducts data quality checks and can block data consumption if errors are detected, achieving significant coverage for their datasets. Shopify faced scalability issues with their dbt modeling tool and introduced Seamster, an in-house framework for SQL unit testing, allowing for quick detection and resolution of code flaws. Thumbtack automated their data quality assurance process by integrating Datafold's Data Diff tool, which streamlined their data change verification process and improved productivity by automating regression checks. These examples illustrate that data quality management is an ongoing process requiring continuous improvement and a strong data culture, facilitating better data governance and observability.