On a product development project, the delivered product has major issues requiring rework and delaying new feature development. Which action should the project manager take to address the quality problems?

The best action is to plan for continuous validation of the product. This proactive approach integrates quality throughout the development lifecycle, preventing issues rather than reacting to them. Continuous validation includes ongoing testing, feedback loops, and quality checks at every stage, ensuring the product consistently meets requirements and quality standards. Discussing adding business scenario tests with the customer or additional test cases with the product owner are reactive measures that address symptoms rather than the root cause of systemic quality issues. While helpful, they don't establish a comprehensive, ongoing quality strategy. Adding more test scenarios based on issues found is also reactive and focuses on past problems, not preventing future ones across the entire product lifecycle.