A study examined the predictive power of four groups of variables in a public information campaign conducted by a charitable organization to raise funds. The variables related to contributions generally fell within four categories: attitudes, knowledge, promotion (which included both mass media and interpersonal communication), and demographics. Researchers constructed a survey questionnaire to gather information regarding these variables, and 501 subjects were randomly selected from the area telephone directory (only individuals who said they worked more than 30 hours per week qualified). Results supported findings of prior research that contributors were older, more educated, and had higher incomes than non-contributors. Attitudes were also closely related to giving but knowledge was not clearly related. Results indicated that a combination of the statistically significant variables from each group was a stronger predictor than any of the groups by itself, suggesting that additional, as yet unidentified, variables also seemed to be at work in the contribution decision making process. (Tables of data and 28 references are included.) (AEW)