Usability

Usability is not a gut feeling — it is a measurable quality criterion. Every interaction must work without cognitive effort.

Scope

Use this skill when you:

• Evaluate a website or individual pages for usability
• Design or optimize forms
• Design error states and feedback mechanisms
• Conduct a heuristic evaluation based on Nielsen's heuristics
• Aim to increase conversion rates through improved usability
• Need to make content scannable and readable

Principles

1. Don't Make Me Think

Every interaction works without cognitive effort. Users don't read — they scan. Users don't choose optimally — they take the first available path.