Table 3.

Ontology for usability problems in eHealth applications.

Category of usability problem and usability factor			Type of usability factor
Basic system performance
	Technical performance	General
	General system interaction	General
Task-technology fit
	Fit between system and context of use	General
	Fit between system and user	General
	Fit between system and health goals	eHealth-specific
Accessibility
	Accommodation to perceptual impairments or limitations	eHealth-specific
	Accommodation to physical impairments or limitations	eHealth-specific
	Accommodation to cognitive impairments or limitations	eHealth-specific
Interface design
	Design clarity	General
	Symbols, icons, and buttons	General
	Interface organization	General
	Readability of texts	General
Navigation and structure
	Navigation	General
	Structure	General
Information and terminology
	System information	General
	Health-related information	eHealth-specific
Guidance and support
	Error management	General
	Procedural system information	General
	Procedural health-related information	eHealth-specific
Satisfaction
	Satisfaction with system	General
	Satisfaction with system’s ability to support health goals	eHealth-specific