Paul Kuijten and Fredrik Wendt join Dave West again to discuss the third piece of the Professional Product Ownership Capabilities model - Evolve with Validation. They discuss the importance of understanding and validating the "why" behind product features. They discuss the evolution from traditional requirements to user stories and outcomes, and the need for continuous experimentation to validate assumptions. The conversation highlights the shift towards more empirical and economic validation methods, the role of AI in enhancing this process, and the importance of team collaboration in achieving product success.