Large checks are written to invest in products that are deemed to have "product-market fit" - whether that's headcount for a new or existing product within a large company or a brand new startup. As a product manager, you get to have the job to define a product that "fits" - how do you do it? how do you know if you've succeeded? When is the right time to pivot and the right time to double down? We'll explore the data as well as qualitative criteria to define products that customers love and are fiscally viable.