K. Geue et al. Der Fragebogen zur sozialen Integration (FSI) – Psychometrische Testung und Akzeptanz bei Patienten mit hämatologischen Neoplasien 1 Kristina Geue 2 , Robert Richter 2 , Marianne Buttstädt 2 , Elmar Brähler 2 , Susanne Singer 3 Summary The „Fragebogen zur sozialen Integration (FSI)“ – psychometric properties and acceptance in patients with hematological malignancies Objectives: The „Fragebogen zur Sozialen Integration (FSI)“ is the German adaption of the „Social Adjustment Scale (SAS-SR)“. So far, there is no validation of the FSI with regard to patients with cancer. Methods: The scales leisure time, relatives and partnership of the FSI were test-statistically analyzed in hemato-oncological patients. Concordant validity was examined referring to the German version of the „Social Support Questionnaire (F-Sozu)“ and one scale of the „EORTC QLQ-C30“. Results: In N = 184 participants, we observed in 1 % – 20 % missing values for several items. Ceiling effects could be observed for the scales relatives (1.22–2.20), whereby for the scales leisure time (1.27–2.95) and partnership (1.51–3.91) the range was substantially higher. Inter- nal consistency averaged about 0.75 (leisure time, partnership), respectively, 0.69 (relatives). Analyses for validity showed values of –0.23 to –0.50 (F-Sozu) as well as –0.29 to –0.40 (EORTC QLQ-C30), respectively. Conclusion: The FSI is a reliable questionnaire to assess social adjustment within hemato-on- cological cancer patients. However, psychometric properties in previous studies with psycho- somatic patients were better. The high amount of missing values on several items in our study suggests a partial revision of the this instrument would be advisable for use in oncology. Z Psychosom Med Psychother 60/2014, 3–16 Keywords Social Adjustment Scale – Validity – Quality Criteria – Oncology Zusammenfassung Fragestellung: Der Fragebogen zur sozialen Integration (FSI) ist eine deutschsprachige Adap- tierung der Social Adjustment Scale (SAS-SR). Bislang gibt es noch keine Aussagen zu den Testgütekriterien des FSI bei Krebspatienten. Z Psychosom Med Psychother 60, 3–16, ISSN (Printausgabe) 1438-3608, ISSN (online) 2196-8349 © 2014 Vandenhoeck & Ruprecht GmbH & Co. KG, Göttingen  Gefördert von der Deutschen Josè Carreras Leukämie Stiftung e. V. (Projekt-Nr. DJCLS R 07/38p).  Abteilung für Medizinische Psychologie und Medizinische Soziologie der Universität Leipzig.  Abteilung für Epidemiologie und Versorgungsforschung am Institutfür Medizinische Biometrie, Epidemiologie und Informatik der Johannes Gutenberg-Universität Mainz.