As charities are expected to take on more and more of the provision of services to the disadvantaged, they will be calling on volunteers to support that work. The use of volunteers means important cost savings when compared to the use of paid service providers, thus giving one advantage to the voluntary sector when bidding in the mixed economy of welfare. Given the potential for increased use of volunteers, questions of motivation and commitment become very important. Volunteers make up a significant proportion of the human resources used to service social needs, yet previous research has not made it clear why and how volunteers come to give so much of themselves. This research demonstrates that there is an underlying Volunteerism–Activism Attitude which can be measured, and which holds within its four dimensions the key motivations for volunteering. Use of the scale measuring this attitude allows prediction of those people who are most likely (and least likely) to volunteer for charity activity. For charities the scale might provide a useful tool in managing the personnel with whom they are now expected to bid in the quasi‐markets of service provision.