Building an enduring, multi-billion dollar consumer technology company is hard. As an investor, knowing which startups have the potential to be massive and long-lasting is also hard. From both perspectives, identifying companies with this potential is a combination of “art” and “science” — the art is understanding how products work, and the science is knowing how to measure it. At the earliest stages of a company, it comes down to understanding how a product is built to maximize and leverage user engagement. In this presentation, Sarah Tavel shares her "Hierarchy of Engagement" framework she uses to evaluate non-transactional consumer companies she is looking to invest in.