Which practice focuses on creating strong lines to enhance interface design?

The practice that focuses on creating strong lines to enhance interface design is alignment. Alignment refers to the placement of elements in relation to each other and the overall layout of the interface. When elements are properly aligned, it creates a visual connection and establishes a clear structure. This not only improves the appearance of the design but also guides the user's eye through the information presented, making it easier to process and understand.

Strong lines or alignment help in organizing content, indicating relationships between different components, and maintaining consistency across the interface. By using alignment strategically, designers can enhance usability, aesthetic appeal, and overall user experience.