Knowledge and information need questionnaire. The use of a questionnaire to score knowledge and information need regarding the contents and accessibility of 18 health care services that were represented in the website (i.e. general practitioner, rheumatologist, orthopaedic surgeon, physical therapist, specialized arthritis physical therapist, occupational therapist, clinical nurse specialist, orthopaedic shoe technician, podiatrist, home nurse, home help, social worker, psychologist, patient educational programs, consumer organization, hydrotherapy, high-intensity group exercise therapy and supervised exercise for chronically ill people). Subsequently four sum scores are computed that represent a patient’s level of insufficient knowledge contents, insufficient knowledge accessibility, information need contents and information need accessibility. Questions regarding the knowledge about regional health care services: Contents: “To what extent are you familiar with what the following health professionals or health care services in your place of living or region actually do for patients with arthritis?” Accessibility: “To what extent are you familiar with how to get access to and contact the following health professionals or health care services in your place of living or region?”