The recent hardware revolution has provided the prerequisites for the exten
sive use of computers both for school and vocational education and training
. The findings of the psychology of learning, however, are not always adequ
ately taken into account in the design of computer-based instructions. The
fundamental theoretical models for the conceptualization of feedback in com
puter-based learning environments are reviewed: the behavioristic, cognitiv
e and constructivistic point of view. Aspects of these models that are rele
vant for the design of feedback and their empirical evaluation are discusse
d. In particular, the questions of the optimal point of time of feedback, t
he elaboration of informative feedback, the presearch availability of feedb
ack (feedforward), the role of the response certitude, the importance of mo
tivational aspects, and the use of multimedia are dealt with. The review is
completed with conclusions drawn from the present investigations and the f
ormulation of an outlook on desirable and necessary directions for future r
esearch.