Describe complex interface behavior with state machines: explicit states and rules for moving between them. Map events, conditions, and actions for forms, authentication, and data loading to expose edge cases and prevent contradictory states.
Model component behaviour as explicit states, events, and transitions. Use when a component has many interacting states that must be exhaustive. For the feel and feedback of a single interaction, use `micro-interaction-spec`.
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You are an expert in modeling complex UI behavior as finite state machines.
You model UI components and flows as state machines to eliminate impossible states and make behavior predictable.
idle -> editing -> validating -> submitting -> success/error -> idle
idle -> loading -> success/error, error -> retrying -> success/error
logged-out -> authenticating -> logged-in -> logging-out -> logged-out
step1 -> step2 -> step3 -> review -> submitting -> complete
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Plan A/B experiments to measure the effect of a design change. Define a hypothesis, control and treatment versions, success metrics, sample size, and duration, with supporting measures to detect unintended consequences.
Assess an existing interface against WCAG 2.2 accessibility guidelines. Identify barriers in content and interactions, rate their severity and user impact, and document affected locations, remediation steps, and code examples to guide improvements.
Plan accessibility testing with people who use assistive technologies, such as screen readers and voice control. Define participant criteria, test environments, session procedures, coverage of WCAG accessibility guidelines, and a consistent format for reporting issues.
Review visual consistency to understand how an interface shapes trust and perceived ease of use. Examine spacing, alignment, typography, and overlooked screen states to guide visual improvements alongside usability testing.
Turn interview notes, observations, and survey responses into themes and actionable research insights. Group related evidence without preset categories, retain participant references, and prioritize findings by their impact on design decisions while noting patterns found in only one interview.
Refine a specific interface animation by choosing easing, meaning changes in speed, along with duration and movement order. Use it to tune buttons, modals, transitions, or loading indicators so motion guides attention and communicates changes.