The field of medical informatics in its current understanding is defin
ed and criteria distinguishing this field from similar areas are provi
ded. Special consideration is given to its position at a School of Med
icine-in particular to the University of Vienna Medical School with th
e Vienna General Hospital as its teaching hospital. Demands for medica
l informatics and electronic data processing (EDP) in this extended fi
eld of activity come from four different sources: (1) research in medi
cal informatics, (2) teaching of medical informatics as well as EDP tr
aining, (3) EDP service for research and teaching, and (4) EDP hospita
l operations to assist patient care. (Purely administrative EDP demand
s are not considered here.) It is shown that the different demands can
be fulfilled by the usually available institutions involved in medica
l informatics and EDP at a School of Medicine. At many places these in
stitutions are as follows: (1) a department or division of medical inf
ormatics with a possibly attached computer center dedicated to provide
assistance in the area of research and teaching, (2) the computer cen
ter of the respective university the School of Medicine belongs to, (3
) the computer center of the hospital-owned institution responsible fo
r all EDP activities connected to patient care, and (4) external softw
are companies and EDP training centers. To succeed in the development
of an exhaustive, school-wide system of medical informatics and EDP th
at considers the different demands in research, teaching, and EDP hosp
ital operations equally, close and well-suited coordination between th
e institutions involved is necessary.