 The purpose of this study is to assess the impact of participation in the Association of Cancer Online Resources ACOR mailing lists on chronic disease management for cancer patients, we are focusing on several priority areas. These include factors that influence the use of online interventions over time and the effects of patient-provider interactions on the use of eHealth interventions as well as vice versa. We also are breaking new ground in a number of important methodological areas related to online survey research. 