- Intrapersonal factors: characteristics of factors at the individual level. It includes knowledge, attitudes, behavior, self-efficacy, developmental history, gender, age, religious identity, racial/ethnic identity, sexual orientation, economic status, financial resources, values, or goals.
- Interpersonal factors, including family, friends, peers, co-workers, religious networks, customs or traditions.
- Community factors which characteristic the relationships among organizations, institutions, and informational networks.
- Public Policy factors such as local, state, national and global laws and policies.