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Previous research has established that attracting and retaining members is a significant challenge associated with the formation and maintenance of interest groups. Research has also established that interest groups play a significant role in the formation of educational policy. This study will attempt to provide insight as to those factors that influenced members to join one such association--the Illinois Principals Association (IPA). The IPA offers potential members a range of incentives to become involved in the organization. The focus of this study is twofold: (1) to identify the relative significance of material, associative, policy and district incentives in the decision of members to join the IPA and (2) to determine if disaggregated groups of the sample report different significance associated with any of the four incentives. A review of data demonstrated that material incentives were the biggest inducement for members with policy and associative incentives also contributing in statistically significant but descending levels of importance. Analysis of disaggregated groups of the sample demonstrated that associative incentives were statistically more significant for principals who served in leadership roles within the IPA and those coming from districts with fewer schools. Associative and material incentives were also found to be valued in descending importance by rural, suburban and urban principals.