In this phase, designers synthesize and analyze the research data to identify patterns, themes, and insights that will inform the design process.
The following are practical steps that designers can take during the "Define Themes" phase:

Expanded stage alignment
UX Themes align across groups and stages, achieving a better understanding of the work done through their problems to solve and expected outcomes. They can help identify areas of collaboration when teams are working on overlapping user needs or when needs cross workflows—helping to unite stable counterparts, engineering, design, product, and research with a comprehensive approach to executing the category vision.
Increased focus and decreased churn
UX Themes focus on a more significant, holistic problem area rather than discrete features in a milestone. This has the effect of reducing the need for fire drills and mitigating context switching. This focus will allow designers to dive deep into related needs-based problems that lead to a comprehensive experience, including all associated touchpoints in the product. Additionally, helping to allocate more time toward addressing validated user needs with solutions rather than assumptions will reduce design and research churn in the product development process. This approach also benefits the engineering teams as they can focus their efforts and build to the scope envisioned in the theme while reducing context switching and avoiding the need to refactor the code in the event of a redesign.
Enhanced strategic collaboration
UX Themes influence strategy through collaboration with Product Managers to define the goals, identify and prioritize unmet user needs, and transparently maintain and update the product roadmap over time. Themes also allow us to understand our value as a team by measuring our success against the business outcomes our counterparts define for each theme.