Table 1 Information about the interviews.

Interview session	People interviewed	Setting	Gender	Designation/area of expertise
1	2	Industry	M/M	Database supplier
2	1	National Patient Safety Agency	F	Expert in patient safety in primary care
3	1	Department of Health	M	Policy adviser
4	1	Primary Care Information Services	M	Expert in IT applied to health care
5	1	NHS Information Authority	M	IT systems assessor
6	3	Industry	M/M/M	Database supplier
7	1	Industry	M	Systems vendor
8	1	General practice	F	British Medical Association General Practice Committee IT representative
9	3	Academic	F/M/M	Experts in computerised clinical decision support
10	1	National Patient Safety Agency	M	Patients' representative
11	1	Industry	M	Systems vendor
12	1	Medical Protection Society	M	Medical litigation expert
13	1	Medical Defence Union	M	Medical litigation expert
14	1	General practice	F	Salaried GP working with several clinical computer systems
15	1	General practice	M	GP with considerable experience of using clinical computer systems
16	1	National Programme for IT in the NHS	M	Policy maker
17	1	General practice	F	GP with relatively little experience of using clinical computer systems
18	1	General practice	M	GP expert user of computerised patient call and recall
19	1	General practice	M	GP with moderate experience of using clinical computer systems
20	1	Academic	M	Expert in computerised decision support in healthcare
21	1	Industry	M	Systems vendor
22	1	Various	M	Expert in IT applied to primary health care
23	1	Department of Health	M	Policy maker
24	1	General practice	M	GP expert user of computerised patient call and recall
25	2	Academic	F/F	Psychologists undertaking human factors research