It is important to clearly explain the goal of the questionnaire and the way it will be analysed. The redaction of the invitation/introduction letter is thus crucial. “Stressing the practical policy application of the Delphi yield to experts panelists to aid their retention” (Rowe, 2011102, p1489).
The research team should have managers skills to follow up the returned questionnaires and mailing
The utilization of online tools could be very useful as well for the research team (rapid results) as for the participants.
While anonymity in the process of the Delphi is required, “using social rewards for recognition in participation, such as subsequently publishing panel membership listings” (Rowe, 2001102, p1489) could improve panelists recruitment and retention.