Principle 3: Understandable

Test the

1. proper identification of language,
2. predictability of the page, and
3. assistance provided for completing complex tasks.

Guideline 3.1 Readable

• 3.1.1 Language of page
• 3.1.2 Language of parts

Guideline 3.2 Predictable

• 3.2.1 On focus
• 3.2.2 On input
• 3.2.3 Consistent navigation
• 3.2.4 Consistent identification
• 3.2.6 Status changes

Guideline 3.3 Input assistance

• 3.3.1 Error identification
• 3.3.2 Labels or instructions
• 3.3.3 Error suggestions
• 3.3.4 Error prevention