People selected to be part of the sample are interviewed on the phone by a trained interviewer.People are intercepted in a central location for a computerized or paper survey.Mailed, faxed, or couriered with return mechanism generally included.Computer-delivered via intranet, Internet, or online service.People selected to be part of the sample are interviewed in person by a trained interviewer.Sent via mobile device service provider {(}(}to phone, tablet{)}