These aims will be evaluated in one-year prospective study. Patients who use the portal will be randomized to control (i.e., access to routine portal-related information) and intervention groups (i.e., targeted and periodic messages designed to capture data relevant to self-management; to improve knowledge of their specific disease, tests, and risks; to devise time-dependent goals; and to motivate self-efficacy). Outcomes including activation, satisfaction, and adherence will be measured by telephone interview prior to and one year after intervention, and by lab and clinical measures and data available from the EHR. We will also evaluate potential selection issues among those who sign on to the e-portal by administering the same baseline interview to a matched (by disease and by age) random sample of patients who do not sign on to the e-portal.