Analyses of preference for the timing of uncertainty resolution usuall
y assumes all uncertainty to resolve in one point in time. More realis
tically, uncertainty should be modelled to resolve gradually over time
. Kreps and Porteus (1978) have introduced an axiomatically based mode
l of time preference which can explain preferences for gradual uncerta
inty resolution. This paper presents an experimental test of the Kreps
-Porteus model. We derive implications of the model relating preferenc
es for gradual and one-time resolving lotteries. Our data do not suppo
rt the Kreps-Porteus model but show that some of the behaviour observe
d may be explained by similarity heuristics.