Which three of the following are dialogue principles?

The dialogue principles are a set of seven general ergonomic principles for the design of the user interface's interactive behavior, as defined in the international standard ISO 9241-110. The three principles listed among the correct options are:
- Suitability for the task: The dialogue supports users in completing their tasks effectively and efficiently.
- Conformity with user expectations: The dialogue is consistent and corresponds to predictable user conventions and context.
- Suitability for learning: The dialogue supports and guides the user in learning to use the system.

C. "Suitability for usability" is too general; usability is the outcome achieved by applying specific principles, not a principle itself.
E. "Suitability for engagement" relates to user experience goals like enjoyment and emotional connection, but it is not one of the seven formal dialogue principles.
F. Accessibility is a crucial design goal, ensuring use by people with disabilities, but it is not listed as one of the seven dialogue principles in ISO 9241-110.

1. UXQB® Certified Professional for Usability and User Experience – Foundation Level (CPUX-F) Curriculum, Version 3.11, 2023-07-01, Chapter 4.3.1 "Dialogue principles (ISO 9241-110)", pp. 64-65.

2. ISO 9241-110:2020, "Ergonomics of human-system interaction — Part 110: Interaction principles", Section 5 "Interaction principles".