Competence is based on knowledge how to behave successfully in different si
tuations. The independent acquisition of such knowledge requires an accumul
ation of experiences about what behaviour leads to what effects under which
conditions. Learning of contingencies between behavioural acts and their e
ffects is a traditional topic, however acquiring knowledge about the depend
ence of such contingencies on critical conditions has been seldom examined
so far. fn this paper corresponding experiments are reported: subjects were
presented varying initial situations where they had to select among simple
behavioural acts in order to reach a given goal. The adaptation of behavio
ur to various conditionalized contingencies between acts and effects is exa
mined It is shown that the mere existence of such contingencies is insuffic
ient in order to accomplish the learning task. Rather, further factors have
to be added in order to turn the learning process into the right direction
. The influence of some of these factors is reported and the results are di
scussed with regard to theoretical implications as well as possible applica
tions.