In which step of planning a design sprint is the user problem defined?1 pointGather suppliesFind the right spaceUser researchCall in the experts

The step of planning a design sprint where the user problem is defined is typically during the User Research phase.

Explanation

User research is a critical part of the design sprint process because it focuses on understanding the needs, challenges, and requirements of the target users. During this phase, stakeholders gather insights through various methods such as interviews, surveys, or observations. By emphasizing users' experiences and pain points, the team can clearly define the user problem that needs addressing. This definition is pivotal because it guides the subsequent phases of the sprint, including ideation, prototyping, and testing. Without a well-defined user problem, the entire sprint can lose direction, leading to solutions that do not effectively meet user needs.

Thus, the correct answer to your question is User Research.