We evaluated the status of nationally top-ranked managed care organizations' (MCOs) asthma disease management programs to identify "best practices" in the environmental treatment and control of asthma. Application materials were developed and mailed to the top 34 managed care organizations, as determined by the ranked results from the October 1998 edition of US News and World Report. Based on the results of a staff and panel review, five applicants were selected for site visitation. The results of the site visits determined two finalists and three runners-up. We recommend that MCOs integrate population and community-based strategies and seek an emphasis on prevention. We encourage collaborations with other organizations and agencies. We endorse home visitation to assess environmental factors and also support use of telephonic case management. We think that smoking cessation programs should be coordinated with asthma management. We consider it important to use alternative forms of communication such as the Internet. And we find that it is important to be mindful of language, culture, and literacy.