The interaction principles are general criteria for the design of user-friendly interactive systems. Seven interaction principles are defined in the DIN EN ISO 9241-110 standard:

• Suitability for the user's tasks
• Self-descriptiveness
• Conformity with user expectations
• Learnability
• Controllability
• Use error robustness
• User engagement

Originally, the standard specified seven dialogue principles. However, these were revised and renamed interaction principles.