The focus of the current issue 1-2/2018 of GMS Medizin – Bibliothek – Information is on cooperation of medical libraries. The authors in this issue are Martina Semmler-Schmetz, Jutta Matrisciano, Oliver Weiner & Iris Reimann (Cooperations with internal and external partners: examples from diverse service areas of medical university libraries), Sandra Rümmele & Friederike Wille (Cooperations of the Central Medical Library at the University Medical Center Hamburg-Eppendorf), Susanne Pütz-Jagner (Cooperation with libraries in Germany concerning archiving rules for medical print journals in Germany), Bruno Bauer (Cooperations in literature and information supply of medical faculties and universities in Austria) and Dietrich Nelle & Bruno Bauer ...