A study population of men and women over 19 years will be identified through nurse practitioners, primary care networks, and other practicing primary care physicians located within the Northern Health, Fraser Health, Interior Health, Vancouver Island Health and Vancouver Coastal Health Authorities. Patients will be eligible if they have two or more of the five targeted chronic diseases; daily Internet access (home, work or other environment) by and means; and able to read, write and understand English without difficulty. A total of 318 patients (159 per group) will be recruited and randomized to either usual care, or a 24-month interactive chronic disease management program delivered via the Internet.