Describe observable evidence: what opens the interface, where it appears, whether the page remains usable, what content it contains, and how it closes.
Compare nearby alternatives (e.g., Tooltip, Popover, Hover Card) by asking questions that can change the result rather than assuming the first matching keyword.
Copy a testable brief that records trigger, dismissal, modality, focus, keyboard, placement, mobile behavior, excluded alternatives, and acceptance checks.
Understand the three levels: UI element (broad observable thing), UI component (reusable implementation unit), and UI pattern (repeatable solution linking form to behavior).