Patients with fibrotic insterstitial lung disease (ILD) participating in inpatient rehabilitation or in outpatient pulmonary care will be invited to participate in this observational study. Patients will fill out questionnaire regarding quality of life and symptoms at baseline and follow-up (at the end of rehabilitation or after the second outpatient ILD consultation). Additionally, clinical data obtained in clinical routine or for the IIP registry will be used for this project. The aim is to assess changes in self-efficacy and quality of life over time and to establish a control cohort for a later feasibility study on a educational and self-management intervention (currently in planning).