UX Heuristics Framework

Practical usability principles for evaluating and improving user interfaces. Based on a fundamental truth: users don't read, they scan. They don't make optimal choices, they satisfice. They don't figure out how things work, they muddle through.

Core Principle

"Don't Make Me Think" - Every page should be self-evident. If something requires thinking, it's a usability problem.

The foundation: Users have limited patience and cognitive bandwidth. The best interfaces are invisible -- they let users accomplish goals without ever stopping to wonder "What do I click?" or "Where am I?" Every question mark that pops into a user's head adds to cognitive load and increases the chance they'll leave. Design for scanning, satisficing, and muddling through -- because that's what users actually do.

Scoring

Goal: 10/10. When reviewing or creating user interfaces, rate them 0-10 based on adherence to the principles below. A 10/10 means full alignment with all guidelines; lower scores indicate gaps to address. Always provide the current score and specific improvements needed to reach 10/10.

Krug's Three Laws of Usability

1. Don't Make Me Think

Core concept: Every question mark that pops into a user's head adds to their cognitive load and distracts from the task.

Why it works: Users are on a mission. They don't want to puzzle over labels, wonder what a link does, or decode clever marketing language. The less thinking required, the more likely they complete the task.

Key insights:

• Clever names lose to clear names every time
• Marketing-speak creates friction; plain language removes it
• Unfamiliar categories and labels force users to stop and interpret
• Links that could go anywhere create uncertainty
• Buttons with ambiguous labels cause hesitation

Product applications:

Context	Application	Example
Navigation labels	Use self-evident names	"Get directions" not "Calculate route to destination"
CTAs	Use action verbs users understand	"Sign in" not "Access your account portal"
E-commerce	Match user mental models	"Add to cart" not "Proceed to purchase selection"
Form labels	Describe what's needed plainly	"Email address" not "Electronic correspondence identifier"
Error states	Tell users what to do next	"Check your email format" not "Validation error"

Copy patterns:

• Self-evident labels: "Sign in", "Search", "Add to cart"
• Action-oriented buttons: verb + noun ("Create account", "Download report")
• Avoid jargon: "Save" not "Persist", "Remove" not "Disassociate"
• If a label needs explanation, simplify the label

Ethical boundary: Clarity should serve users, not obscure information. Never use plain language as a veneer to hide unfavorable terms.

See: references/krug-principles.md for full Krug methodology.

2. It Doesn't Matter How Many Clicks

Core concept: The myth says "users leave after 3 clicks." The reality is users don't mind clicks if each one is painless, obvious, and confidence-building.

Why it works: Cognitive effort per click matters more than click count. Three mindless, confident clicks are far better than one click that requires deliberation. Users abandon when they lose confidence, not when they run out of patience for clicking.

Key insights:

• Each click should be painless (fast, easy)
• Each click should be obvious (no thinking required)
• Each click should build confidence (users know they're on the right path)
• Three mindless clicks beat one confusing click every time
• Users abandon when confused, not when they've clicked too many times

Product applications:

Context	Application	Example
Information architecture	Prioritize clarity over depth	Shallow nav with clear labels over deep nav with vague ones
Checkout flows	Make each step obvious	Clear step indicators with descriptive labels
Settings	Organize into clear categories	"Account > Security > Change password" (3 confident clicks)
Search results	Let users drill down confidently	Category filters that narrow results progressively
Onboarding	Guide with small, clear steps	Wizard with one clear action per step

Copy patterns:

• Progress indicators: "Step 2 of 4: Shipping details"
• Breadcrumbs: "Home > Products > Shoes > Running"
• Confirmations at each step: "Great, your email is verified. Now let's set up your profile."
• Clear link text: "View all running shoes" not "Click here"

Ethical boundary: Don't use extra steps to bury cancellation flows or make opting out harder. Every click should move users toward their goal, not away from it.

See: references/krug-principles.md for Krug's click philosophy and scanning behavior.

3. Get Rid of Half the Words

Core concept: Get rid of half the words on each page, then get rid of half of what's left. Brevity reduces noise, makes useful content more prominent, and shows respect for the user's time.

Why it works: Users scan -- they don't read. Every unnecessary word competes with the words that matter. Removing fluff makes important content more discoverable and pages shorter.

Key insights:

• Happy-talk ("Welcome to our website!") wastes space
• Instructions nobody reads should be removed
• "Please" and "Kindly" and polite fluff add noise
• Redundant explanations dilute the message
• Shorter pages mean less scrolling and faster scanning

Product applications:

Context	Application	Example
Landing pages	Cut welcome copy, lead with value	Remove "Welcome to..." paragraphs
Error messages	State problem and fix, nothing more	"Password too short (min 8 chars)" not a paragraph
Tooltips	One sentence max	"Last 4 digits of your card" not a full explanation
Empty states	Action-oriented, minimal	"No results. Try a different search."
Onboarding	One instruction per screen	"Choose your interests" not a wall of explanatory text

Copy patterns:

• Before: "Please kindly note that you will need to enter your password in order to proceed to the next step."
• After: "Enter your password to continue."
• Before: "We've received your message and will get back to you as soon as possible."
• After: "Message sent. We'll reply within 24 hours."

Ethical boundary: Brevity must not mean omitting critical information. Concise disclosures for pricing, terms, and data usage are a user right.

See: references/krug-principles.md for Krug's word-cutting methodology.

4. The Trunk Test

Core concept: A test for navigation clarity: if users were dropped on any random page (like being locked in a car trunk and released at a random spot), could they instantly answer six key questions?

Why it works: Good navigation gives users constant orientation. If users can't identify where they are and what their options are, they feel lost and leave.

Key insights:

• Users must know what site they're on (brand/logo visible)
• Users must know what page they're on (clear heading)
• Major sections must be visible (navigation)
• Options at this level must be clear (links/buttons)
• Position in hierarchy must be apparent (breadcrumbs)
• Search must be findable

Product applications:

Context	Application	Example
Global nav	Persistent site ID and sections	Logo top-left, main nav always visible
Page headers	Clear, descriptive page titles	"Running Shoes - Men's" not just "Products"
Breadcrumbs	Show hierarchy on all inner pages	"Home > Products > Shoes > Running"
Mobile nav	Maintain orientation in hamburger menus	Highlight current section, show breadcrumbs
Search	Visible search on every page	Search box in header, not buried in footer

Copy patterns:

• Page titles that match the link the user clicked
• "You are here" indicators (highlighted nav items, bold breadcrumb)
• Section headings that orient: "Your Account > Billing" not just "Settings"
• Footer navigation for secondary discovery

Ethical boundary: Navigation should honestly represent site structure. Don't use misleading labels to funnel users into marketing pages.

See: references/krug-principles.md for the full Trunk Test methodology.

Nielsen's 10 Usability Heuristics

1. Visibility of System Status

Keep users informed about what's happening through timely feedback. Every action needs acknowledgment — progress bars for uploads, confirmations for submissions, skeleton screens for loading. Silent failures destroy trust. Copy pattern: "Saving..." → "Saved" (immediate state transitions).

2. Match Between System and Real World

Speak users' language, not system language. Use "Sign in" not "Authenticate", "Search" not "Query." Follow real-world metaphors (trash bin, shopping cart) and natural ordering (street → city → state → zip). One term per concept, everywhere.

3. User Control and Freedom

Provide clear "emergency exits." Undo beats "Are you sure?" dialogs every time — users click through confirmations without reading. Every flow needs cancel/exit, back buttons must never break, and soft delete with undo beats permanent deletion.

4. Consistency and Standards

Same words, styles, and behaviors should mean the same thing throughout. Internal consistency (your app) and external consistency (platform conventions: logo top-left, search top-right). Pick one term per concept — "Projects" everywhere, never mixing with "Workspaces."

5. Error Prevention

Prevent problems before they occur. Constrained inputs (date pickers over text fields), autocomplete, sensible defaults, and "unsaved changes" warnings. Two error types need different prevention: slips (accidental wrong action) and mistakes (wrong intention).

6. Recognition Rather Than Recall

Minimize memory load — show options, don't require memorization. Breadcrumbs, recent searches, pre-filled fields, dropdowns with decoded values (country names, not codes). Human working memory holds ~7 items; recognition is far easier than recall.

7. Flexibility and Efficiency of Use

Serve both novices and experts. Keyboard shortcuts, touch gestures, bulk actions, saved searches, and command palettes (Cmd+K) speed up power users. Progressive disclosure keeps it simple for beginners while experts access full power.

8. Aesthetic and Minimalist Design

Every element must earn its place. Signal-to-noise ratio determines usability — when everything screams for attention, nothing stands out. Show what matters now, hide what doesn't. One primary CTA per page, not five competing ones.

9. Help Users Recognize, Diagnose, and Recover from Errors

Error messages need three parts: what happened, why, and how to fix it. Plain language always ("Connection failed" not "ECONNREFUSED"), specific ("Password must be 8+ characters" not "Invalid"), never blame the user, and preserve their input.

10. Help and Documentation

Help should be searchable, task-focused ("How to..." not technical reference), and contextual (tooltips, inline hints). Types: inline help, contextual "?" icons, searchable knowledge base, guided tours, live support.

See: references/nielsen-heuristics.md for detailed examples, product applications, copy patterns, and ethical boundaries for all 10 heuristics.

Severity Rating Scale

When auditing interfaces, rate each issue:

Severity	Rating	Description	Priority
0	Not a problem	Disagreement, not usability issue	Ignore
1	Cosmetic	Minor annoyance, low impact	Fix if time
2	Minor	Causes delay or frustration	Schedule fix
3	Major	Significant task failure	Fix soon
4	Catastrophic	Prevents task completion	Fix immediately

Rating Factors

Consider all three:

1. Frequency: How often does it occur?
2. Impact: How severe when it occurs?
3. Persistence: One-time or ongoing problem?

Common Mistakes

Mistake	Why It Fails	Fix
Mystery meat navigation	Icons without labels force guessing	Add text labels alongside icons
Too many choices	Decision paralysis slows users	Reduce to 7 plus/minus 2 items
No "you are here" indicator	Users feel lost in the hierarchy	Highlight current section in nav and breadcrumbs
No inline validation	Submit, error, scroll cycle frustrates	Validate on blur with specific messages
Unclear required fields	Users confused about what's mandatory	Mark optional fields, not required (most fields should be required)
Wall of text	Nobody reads dense paragraphs	Break up with headings, bullets, whitespace
Jargon in labels	Users don't speak your internal language	User-test all labels, use plain language
No loading indicators	Users think the system is broken	Show spinner, progress bar, or skeleton screen
Tiny tap targets	Mobile users misclick constantly	Minimum 44x44 px touch targets
Hover-only information	Mobile and keyboard users miss it entirely	Don't hide critical info behind hover states
No undo	Users afraid to take any action	Provide undo for all non-destructive actions
Poor error messages	"Invalid input" tells users nothing	Explain what's wrong and how to fix it
Low contrast text	Unreadable for many users	WCAG AA minimum (4.5:1 contrast ratio)
Inconsistent nav location	Users can't find navigation	Fixed position, same location on every page
Broken back button	Fundamental browser contract violated	Never hijack or break browser history

Quick Diagnostic

Audit any interface:

Question	If No	Action
Can I tell what site/page this is immediately?	Users are lost and disoriented	Add clear logo, page title, and breadcrumbs
Is the main action obvious?	Users don't know what to do	Create visual hierarchy, single primary CTA
Is the navigation clear?	Users can't find their way	Apply the Trunk Test, add "you are here" indicators
Can I find the search?	Users with specific goals are blocked	Add visible search box in header
Does the system show me what's happening?	Users lose trust and re-click	Add loading states, confirmations, progress indicators
Are error messages helpful?	Users get stuck on errors	Rewrite in plain language with specific fix
Can users undo or go back?	Users are afraid to act	Add undo, cancel, and back options everywhere
Does it work without hover?	Mobile and keyboard users are excluded	Replace hover-only interactions with visible alternatives
Are all interactive elements labeled?	Users guess at icon meanings	Add text labels or descriptive tooltips
Does anything make me stop and think "huh?"	Cognitive load is too high	Simplify -- if it needs explanation, redesign it

Heuristic Conflicts

Heuristics sometimes contradict each other. When they do:

• Simplicity vs. Flexibility: Use progressive disclosure
• Consistency vs. Context: Consistent patterns, contextual prominence
• Efficiency vs. Error Prevention: Prefer undo over confirmation dialogs
• Discoverability vs. Minimalism: Primary actions visible, secondary hidden

See: references/heuristic-conflicts.md for resolution frameworks.

Dark Patterns Recognition

Dark patterns violate heuristics deliberately to manipulate users:

• Forced continuity (hard to cancel)
• Roach motel (easy in, hard out)
• Confirmshaming (guilt-based options)
• Hidden costs (surprise fees at checkout)

See: references/dark-patterns.md for complete taxonomy and ethical alternatives.

When to Use Each Method

Method	When	Time	Findings
Heuristic evaluation	Before user testing	1-2 hours	Major violations
User testing	After heuristic fixes	2-4 hours	Real behavior
A/B testing	When optimizing	Days-weeks	Statistical validation
Analytics review	Ongoing	30 min	Patterns and problems

Reference Files

• krug-principles.md: Full Krug methodology, scanning behavior, navigation clarity
• nielsen-heuristics.md: Detailed heuristic explanations with examples
• audit-template.md: Structured heuristic evaluation template
• dark-patterns.md: Categories, examples, ethical alternatives, regulations
• wcag-checklist.md: Complete WCAG 2.1 AA checklist, testing tools
• cultural-ux.md: RTL, color meanings, form conventions, localization
• heuristic-conflicts.md: When heuristics contradict, resolution frameworks

Further Reading

This skill is based on usability principles developed by Steve Krug and Jakob Nielsen:

• "Don't Make Me Think, Revisited" by Steve Krug
• "Rocket Surgery Made Easy" by Steve Krug (DIY usability testing)
• "10 Usability Heuristics for User Interface Design" by Jakob Nielsen (Nielsen Norman Group)

About the Author

Steve Krug is a usability consultant who has been helping companies make their products more intuitive since the 1990s. His book "Don't Make Me Think" (first published in 2000, revised 2014) is the most widely read book on web usability and is considered essential reading for anyone involved in designing interfaces. Known for his accessible, humorous writing style and his advocacy for low-cost usability testing, Krug demonstrated that usability doesn't require a lab or a large budget -- just watching a few real users try to accomplish tasks.

Jakob Nielsen, PhD is co-founder of the Nielsen Norman Group (NN/g) and is widely regarded as the "king of usability." His 10 Usability Heuristics for User Interface Design, published in 1994, remain the most-used framework for heuristic evaluation worldwide. Nielsen has been called "the guru of Web page usability" by The New York Times and has authored numerous influential books on usability engineering. His research-driven approach to interface design helped establish usability as a recognized discipline in software development.