One of the basics of the sociological theory of action is the assumpti
on of a special ''definition'' of the situation, out of which the part
icular ''logic'' of action arises. A model of the definition of the si
tuation is developed which links the considerations of the Thomas-theo
rem and the interpretative paradigm with recent conceptions of attitud
e-theory. The ''objective'' background, which is orientated on the the
ory of the household-production, is provided by the concept of the soc
ial production functions. It is shown how the incentives and the stabi
lity of this background as well as the selection of cultural preshaped
''models'' of the situation and of the ''modus'' of information proce
ssing define how the actors look at the situation-In this way it is sh
own that ''rationality'', indeed, is only a special and cultural defin
ed model of the situation and/or a particular modus of information-pro
cessing. But the variables and the rules of selection of this internal
act of the ''definition'' of the situation again follow, at least for
mally, the theory of rational choice.