Colorectal cancer (CRC) is the second leading cause of cancer-related deaths in the United States. Results from randomized clinical trials and intervention studies have suggested that implementation of a CRC screening program for men and women over age 50 results in reduced CRC mortality. However, for this reduction to be fully realized, it is imperative that all positive screening tests are followed by complete diagnostic evaluation (CDE). Numerous intervention programs have been used to improve initial CRC screening rates, but data indicate that outside the research setting, less than half of patients with a positive fecal occult blood test (FOBT) screening result undergo CDE. To enhance the translation of this best practice recommendation to clinical practice, the investigators propose to implement an electronic event notification intervention (CRC-ENS) directed at making physician and system level changes to increase the proportion of patients with an abnormal FOBT that undergo CDE.