This document discusses sourcing the right participants for UX research and testing. It begins by noting that sourcing participants is often the #1 challenge and outlines an agenda to cover various sourcing methods. The methods are divided into two categories: doing it yourself using your own customers or visitors, and using external companies. Doing it yourself involves techniques like guerrilla usability testing, using customer databases, social media sites, websites/apps, and in-store locations. Using external companies involves online panels, traditional recruiting firms, new recruiting startups, specialized panels, and a new sourcing engine. It provides tips on screeners, study quality, incentives, and special considerations for regulated industries, B2B, research with kids