Table 6.

Overall scoring of the 19 systems on the 5 key metrics.

Scoresa	Effectiveness (19 systems scored)	Efficiency (16 systems scored)	Ease of learning (13 systems scored)	User satisfaction (16 systems scored)	Cognitive load (13 systems scored)
Total weighted score	256	204	184	200	176
Maximum attainable total score (max. weight x no. scored)	380	320	260	320	260
Percentage score (total/max x 100)	67%	64%	71%	63%	68%

^aOverall usability percentage score=(sum of total weighted scores/sum of max attainable scores)x100%=66%.