At Brigham and Women's Hospital, we have developed an electronic alert system, which is integrated with the CPOE system but functions independently. We have created risk score criteria by which the system determines the risk of DVT or PE for a particular patient. All the information needed to accomplish this risk assessment is stored in the computer system, allowing the process to run in an automated fashion. The system according to present criteria determines whether to generate an alert. To do this, the system checks for the existence of current orders for prophylaxis, using the Brigham and Women's Hospital CPOE system. The presence of medication class orders for anticoagulants or general care orders for mechanical prophylaxis prevents the computer from issuing an alert. We will enhance this computerized system to produce a series of alerts that provide more information related to prescription or omission of thromboprophylaxis. We aim to test this new system in our proposed study.