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Table 2 The number of the identified problems per method and usability group

From: A combination of two methods for evaluating the usability of a hospital information system

 Heuristics evaluation
N (%)
Think aloud
N (%)
Think aloud + Heuristics evaluation
N (%)
Both Think aloud and Heuristics evaluation
N (%)
Only Think aloud
N (%)
Only Heuristics evaluation
N (%)
Satisfaction120 (44.6)113 (43.46)190 (45)43 (40.5)70 (45.45)77 (47.23)
Effectiveness23 (8.5)26 (10)34 (8)15 (14.15)11 (7.14)8 (4.9)
Efficiency20 (7.5)45 (17.3)53 (12.5)12 (11.35)33 (21.43)8 (4.9)
Learnability38 (14.12)26 (10)53 (12.5)11 (10.4)15 (9.75)27 (16.57)
Error68 (25.28)50 (19.24)93 (22)25 (23.6)25 (16.23)43 (26.4)
No. of usability problems269260423106154163
Percentage of the problems identified by the two methods to the total number of problems   25%36%39%