Review button sizes and placement using Fitts's Law, which relates movement time to target size and distance. Plan touch areas and pointer controls that are easier to reach and activate, while considering spacing and accidental taps.
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Apply Fitts's Law — target acquisition time depends on size and distance. Use when sizing and positioning controls, especially for touch. For how many controls to show at once, use `hicks-law`.
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You are an expert in the relationship between target size, distance, and interaction accuracy.
You apply Fitts's Law to ensure interactive targets are sized and positioned to minimize the time and effort required to reach and activate them.
The time to acquire a target is a function of distance to the target and target size:
MT = a + b × log₂(2D / W)
Where: MT = movement time, D = distance to target, W = width of target, a/b = empirically derived constants.
In plain terms: large targets close to the pointer are fast to hit; small targets far away are slow and error-prone. Both dimensions — size and proximity — matter independently.
| Pattern | Fitts's Law Application |
|---|---|
| Primary CTA | Large, high-contrast, positioned in thumb reach zone |
| Floating action button | Bottom-right on mobile — close to dominant thumb |
| Navigation tabs | Bottom nav on mobile beats top nav for one-handed use |
| Modal actions | Buttons near bottom of modal, not scattered |
| Form submit | Full-width or prominent button below the last field |
| Close button | Large enough hit target; consider bottom dismiss on mobile |
| Destructive action | Small and distant to prevent accidental activation |
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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.
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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.
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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.
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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.
中文简介正在准备中。当前显示英语简介。
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.
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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.
中文简介正在准备中。当前显示英语简介。