How can you get everyone in the team to understand your customers - especially if you're not 100% certain yourself? Personas - research-based examples of the people who use your product - can help. Unfortunately in agile contexts traditional persona development often doesn't work well. How do we use personas when our understanding of the product and market is still evolving? What happens when we lack the resources for extended up-front research? How do teams manage changes to existing personas? How should we communicate personas? How do we keep the value of long-term research in an environment of rapid iteration or continuous delivery? We'll show you how to incrementally build models of your customer with the whole team. We'll be demonstrating practical techniques for documenting personas, communicating ongoing research, and integrating it with agile approaches to product vision and strategy.