Software Quality and Usability

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Usability is a quality characteristic that describes how easily software can be understood, learned, and used by its users.

In a Nutshell

Usability means that software is intuitive, efficient, and satisfying to use. Key factors: UX design, accessibility, user testing, feedback loops.

Technical Overview

Usability is a quality characteristic defined in ISO 25010 that describes how easily software can be understood, learned, and used by its users. It encompasses usability itself (effectiveness, efficiency, satisfaction), accessibility, and user experience (UX). Usable software reduces training costs, errors, and dropout rates.

Usability Principles

1. Effectiveness

Can users accomplish their goals?

// Poor: Goal unclear
<button>OK</button>

// Good: Goal clear
<button>Complete Order</button>

2. Efficiency

Can users reach their goals quickly?

// Poor: Too many clicks
Dashboard → Settings → Account → Change Password

// Good: Direct access
Settings → Change Password

3. Satisfaction

Is the experience pleasant?

// Poor: No feedback
await saveData();

// Good: With feedback
await saveData();
showNotification('Data saved!');

Accessibility

WCAG Principles

Examples

<!-- Poor: No alt text -->
<img src="chart.png" />

<!-- Good: With alt text -->
<img src="chart.png" alt="Revenue growth 2024: +15%" />

<!-- Poor: No label -->
<input type="text" />

<!-- Good: With label -->
<label for="email">Email</label>
<input type="text" id="email" />

<!-- Poor: No focus management -->
<button onclick="openModal()">Open</button>

<!-- Good: With focus management -->
<button onclick="openModal()" aria-expanded="false">Open</button>

User Testing

Methods

Example Test

// Usability test: Registration
const testScenarios = [
  {
    task: 'Create a new account',
    steps: [
      'Click Register',
      'Fill out form',
      'Confirm email'
    ],
    successCriteria: 'Completed in < 2 minutes'
  }
];

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UX Design Principles

Jakob’s Law

Users behave in ways they’re already familiar with from other websites.

// Poor: Unfamiliar pattern
<button>Proceed to next stage</button>

// Good: Familiar pattern
<button>Continue</button>

Fitts’s Law

The time to reach a target depends on its size and distance.

// Poor: Small button far away
<button style="padding: 4px; margin-left: 500px">Submit</button>

// Good: Large button close by
<button style="padding: 16px; margin: 8px">Submit</button>

Hick’s Law

Decision time increases with the number of options.

// Poor: Too many options
<select>
  <option>Option 1</option>
  <option>Option 2</option>
  <!-- 20 more options -->
</select>

// Good: Grouped options
<select>
  <optgroup label="Category A">
    <option>Option 1</option>
  </optgroup>
  <optgroup label="Category B">
    <option>Option 2</option>
  </optgroup>
</select>

Best Practices

• Progressive Disclosure: Reveal information gradually to avoid overwhelming users
• Consistency: Maintain unified design patterns
• Feedback: Provide immediate responses to user actions
• Error Prevention: Prevent errors rather than just reporting them
• Accessibility: Comply with WCAG 2.1 AA standards

Key Takeaways for Review

• Usability according to ISO 25010: effectiveness, efficiency, satisfaction
• WCAG principles: Perceivable, Operable, Understandable, Robust
• UX principles: Jakob’s Law, Fitts’s Law, Hick’s Law
• User testing: Usability testing, A/B testing, heuristic evaluation
• Accessibility: Screenreaders, keyboard navigation, alt text

FAQ

Continuing Your Software Quality Learning Path

All articles in the software quality learning path are now complete. Return to the Software Quality Learning Path Overview.

Sources

1. https://iso25000.com/index.php/en/iso-25000-standards/iso-25010.html
2. https://www.w3.org/WAI/WCAG21/quickref/
3. https://www.nngroup.com/articles/ten-usability-heuristics/

Recommended Books on Software Quality

To deepen your understanding of usability, UX, and software quality, we recommend the following books:

Software Engineering

Books about software quality, clean code, code reviews and software development processes

Clean Code: A Handbook of Agile Software Craftsmanship von Robert C. Martin

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The Pragmatic Programmer: Your Journey to Mastery von David Thomas, Andrew Hunt

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