All types of self-completion questionnaires should be accompanied by a cover letter, which should include:
A.
The purpose and significance of the research
B.
The way through which the prospective respondents are selected
C.
The instructions on how to answer and return the questionnaire
D.
A promise of anonymity and confidentiality
E.
An expression of appreciation for the respondents’ time and help
F.
Incentives for returning the questionnaire if there are any