The interviews were semi-structured in nature,lasting 2 hours in average. The typical composition of participants in the interviews included two to three interviewers and one to three company representatives. As a result,a total of 33 company representatives participated to the 16 interviews conducted. The interviews were recorded in case of memory lapses,and to support the correctness of interpretation. For each interview,a memo was written based on the recordings and sent to the interviewees to be checked for possible inconsistencies or errors.