Quality assurance (QA) helps improve projects by implementing standards, documentation, and clear workflows. The presenter discusses QA for the Next Europa WCMS project at the European Commission, which uses a standardized QA process and tools to validate subprojects. Various code quality and testing tools are presented, including PHP Mess Detector and PHPUnit. Drupal 8 focuses on cleaning up code based on coding standards through tools like PHP Code Sniffer and the deprecated Coder module.