We propose to use a cluster randomized trial design in several multispecialty private practices to examine the comparative effectiveness of an EHR-based lipid management protocol based on ATP III guidelines vs. usual care. Cluster randomization of participating physicians is useful when blinding is impossible and "contamination" might be a problem, i.e. more aggressive management among a physician's non-intervention patients as a result of experience with intervention patients. Of an estimated 150 primary care physicians at the recruited private practices, we expect at least 100 to consent to participate. Physicians will be clustered for randomization based on the number of patients in their panel that meet ATP III guidelines for statin. Physicians in each cluster will then be individually randomized to the intervention or control arm.