This study focuses on the implementation of an evidence-based HIV risk reduction intervention for HIV-serodiscordant, heterosexual African American couples ("Eban II") in two geographic areas (Northern and Southern California - roughly, Alameda and Los Angeles Counties) that have a high prevalence of HIV infection and risk conditions among African Americans. The Specific Aims are as follows: 1. To evaluate implementation of Eban for HIV serodiscordant African American couples in 10 CBOs in California. To do this, we will document the implementation process and identify barriers and facilitators to Eban's adoption and use by the CBOs. We will interview 200 staff at CBOs to obtain this information. 2. To evaluate the effect of Eban on behavioral and biological outcomes among 180 couples, specifically incidents of protected sex, proportion of condom use, and incident sexually transmitted infections. Eban will be assessed using a randomized delayed enrollment (waitlist) control design to evaluate the impact of treatment on outcomes at posttest and 3-month follow-up (i.e., at these 10 CBOs, Eban will be conducted and offered to couples and evaluated for effectiveness - that is, how well it works in the real world.) 3. To determine the cost-effectiveness of implementation of Eban, based on implementation costs and potential cost savings.