Table 3.

Selection rules applied to the answers of the Web-Delphi round 2 considering the five-level Likert scale: ‘Strongly Disagree (SD)’, ‘Disagree (D)’, ‘Neither Agree nor Disagree (NAD)’, ‘Agree (A)’, ‘Strongly Agree (SA)’

Selection rules	Selection rule
First rule – applied to all drivers from all PESTLE categories	(SA + A) ≥ $\frac{2}{3}$ and SA ≥ $\frac{1}{3}$ and (SD + D) < 10%
Second rule – applied to drivers within the PESTLE categories in which the first rule did not select any driver	[(SA + A) ≥ $\frac{3}{4}$ or SA ≥ $\frac{1}{4}$)] and (SD + D) < 10%