What does the term "priority zero" (P0) refer to in UX design?

The term "priority zero" (P0) in UX design refers to insights or issues that must be addressed for the product to function properly. This concept emphasizes that certain critical elements directly impact the usability and overall success of the product. When a design issue falls into the P0 category, it indicates that this aspect of the user experience is non-negotiable and must be resolved to ensure the product meets its objectives and offers a satisfactory experience for users.

Prioritizing these insights is essential, as neglecting to address them could lead to significant usability problems, ultimately affecting user satisfaction and engagement. Therefore, P0 elements typically require immediate attention during the design and development process to ensure that the final product is both functional and user-friendly.