For some time I have been co-ordinating the oral health program "Special Smiles" offered to athletes taking part in regional Special Olympics Sports Events. Every year I recruit colleagues, dental nurses and dental students from the local dental school to volunteer for these events. Now I want to try to find out what motivates them to volunteer.
Searching the literature, I found references to several measurement-instruments (Special Event Volunteering Scale, International Sporting Event Volunteer Motivation and Satisfaction scale, Olympic Volunteer Motivation Scale....). There seem to be numerous instruments - which one is preferable?