The document outlines the key user experience activities involved in building a lean startup:
1. Learn about users through personas, user journeys, and user experience mapping to understand their needs and goals.
2. Build prototypes in the form of wireframes and usability testing to get early feedback before development.
3. Build the initial product using code, release it to market, and measure how users receive it through further usability testing and analytics. Iterate based on learnings to improve the product.