The prediction of above-average participation in volunteerism : a test of the theory of planned behavior and the volunteers functions inventory in older Australian adults / Jaimi H. Greenslade.

Originally published in The Journal of Social Psychology 2005, pgs 155-172.

In the presecent prospective study of 81 older volunteers from a nonprofit organization in Australia, the authors compared the predictive utility of L. Ajzen's (1998) theory of planned behaviour with that of E.G. Clary and M. Snyder's (1991) functional approach to volunteering. The authors mailed questionaires to 385 volunteers in two waves of data collection. The first wave measured theory-of-planned-behaviour variables and functional-approach variables. The second wave measured self-reported volunteering behaviour for the previous month. Regression analysis supported both the theory of planned behaviour and the functional approach: the theory of planned behaviour accounted for a significantly larger proportion of variance in above-average participation in self-reported volunteerism. The findings of the present study provided some support for both the theory of planned behavior and the functional approach as models of self-reported volunteerism.