Examples of other groups sampled were the Behavior Genetics Association and the Cognitive Science Society.
The sample was drawn randomly from the membership directories of these groups.
Envelopes containing the questionnaire, a stamped return envelope, and cover letter introducing the nature of the study and assuring confidentiality of responses were mailed in September, 1984.
About two weeks after the initial mailing a reminder postcard was sent to individuals who had not yet returned the questionnaire.
Four weeks late a complete second set of materials was sent to those who still had not responded.
A total of 661 individuals responded (65%)