A study was conducted to investigate, using a portion of Smith's Sequential Specificity Model, the relationship between social background, personality, and attitudinal factors and the participation of adult volunteers in the 4-H program in Ohio. Data were collected from a sample of 300 adult 4-H volunteers in Ohio through a mailed questionnaire; a response rate of 72 percent was achieved. The study found that the social background factors positively associated with continued participation were (1) having children in 4-H and (2) having a spouse as a leader. Previous experience as a 4-H member was negatively associated with continued participation. Age, length of residence in the community, and number of children under the age of 9 years were positively associated with a leader's length of service. Number of children ages 12-14 was negatively associated with length of service, suggesting that as a leader's children leave the program, the leader stops serving. Homemakers contributed more hours of service than persons in other categories. Several attitudinal factors, such as attractiveness of 4-H, perceived instrumental value of the leader, flexibility, and influence of significant others, were all positive for involvement in 4-H. Finally, the study determined that a leader's length of service increased if he/she were older, had a spouse as a leader, had children in 4-H, was not a laborer, and perceived 4-H as having something to offer the leader personally. The study recommended that further research be conducted on additional attitudinal and personality factors that may influence volunteering, and investigate why the relationships found in this study, such as previous members failing to volunteer, occur. (KC)