One of the ongoing challenges in the MPT field is that, because MPT products are not yet commercially available (aside from male and female condoms), we do not have ‘real world’ data to inform product development, introduction, and investment decisions. Given this, MPT product developers, researchers, and funders must grapple with critical questions, such as: How impactful do these products need to be for me to consider funding or starting a product development program? Is that impact potential achievable, and under what conditions? How efficacious would the product need to be? What is the market for the product? How many people would need to use the product correctly and consistently? What associated costs will make a product cost-effective or cost-saving?