Table 4 Tactics used to ensure the quality of the research

Construct validity

• Triangulation of data and data collection methods

• Documentation of research process

• Member validation of interview transcripts

• Review of draft versions of the research report by a research expert and a sector expert

External validity

• Documentation of research process

• Rich presentation of findings

• Selected interviewees for maximum variation

Reliability

• Documentation of research process

• Creation of case study database

• Usage of secondary data

• Usage of software package for coding of transcripts

• Triangulation of data and data collection methods

• Multiple respondents

• Interviewees knew the interviewer

• Confidential interviews

• Use of face-to-face interviews

• Member validation of interview transcripts

• Avoiding expression of opinions by interviewer

• Taping and verbatim transcription of interviews