This contribution concerns itself with the fundamental questions of in
terest development and the promotion of interest in instruction. Again
st the background of the Person-Object-Theory of interest, the general
characteristics of interest constructs were illustrated and findings
on the alterability of(average) specific interests experienced by stud
ents were presented. At the center of the theoretical deliberations st
and the principles of a functional theory of interest genesis which ar
e not only explained through the regularity of alterations due to deve
lopment, but also on the basis of psychological mechanisms. A postulat
ion is made that in addition to the cognitive-rational components of t
he formation of intention, the qualities of experience gained through
actions taken also plays a central role. Emotional experiences have a
special significance with respect to the three ''fundamental psycholog
ical needs'' for perception of competence, autonomy and social relatio
nship.