Table 2.

Comparison of our set of inclusive design guidelines with Nielsen heuristics and universal design principles.

Guidelines for DHIsa for older adults	Nielsen heuristics [67]	Universal design principles [68]
Visual design and readability	Aesthetic and minimalist design, and visibility of system status	Perceptible information, and simple and intuitive use
Navigation	User control and freedom, and consistency and standards	Simple and intuitive use, and tolerance for error
Accessibility	Error prevention; and help users recognize, diagnose, and recover from errors	Equitable use and perceptible information
Customization and personalization	Flexibility and efficiency of use (partial match)	Flexibility in use
Social engagement and support	Not directly covered	Equitable use (partial match)
Learnability and educational content	Help and documentation, and the match between the system and the real world	Simple and intuitive use
Multiplatform and device compatibility	Consistency and standards	Equitable use and flexibility in use
Motivation, feedback, and user engagement	Visibility of system status and recognition rather than recall	Perceptible information and tolerance for error
Security and privacy	Error prevention (partial match)	Equitable use
Inclusive language	Match between system and real world (partial match)	Simple and intuitive use
Costs	Not directly covered	Equitable use

^aDHI: digital health intervention.