The document discusses best practices for quality assurance (QA) in digital marketing, emphasizing the importance of integrating QA throughout the entire project lifecycle rather than as a final step. It highlights the challenges faced due to lacking a unified definition of quality, common issues in project management, and the increased costs associated with poor QA practices. The 'shift left' approach promotes proactive quality management from planning to execution, aiming to enhance collaboration and reduce the risk of defects in digital healthcare marketing projects.