An Iterative, Mixed Usability Approach Applied to the Telekit System from the Danish TeleCare North Trial

Table 4

Distribution of usability violations on Rolf Molich’s severity rating scale [29].

Severity degree	Expert 1		Expert 2		Expert 3		Expert 4		Expert 5		Total
	HE1	HE2	HE1	HE2	HE1	HE2	HE1	HE2	HE1	HE2	HE1	HE2
(1) Improvement	12	16	11	5	10	17	14	2	14	3	61	43
(2) Minor problem	8	19	12	21	12	30	19	11	15	13	66	94
(3) Severe problem	3	6	0	9	0	7	7	8	7	8	17	38
(4) Critical problem	2	3	0	3	0	10	0	5	2	2	4	23
(5) Malfunction	3	1	0	0	0	14	0	6	1	4	4	25