How drivers signal, park, escort their children across a street to a preschool, and depart was videotaped unobtrusively for 39 days, to test for consistency of driver behavior and children's crossing behavior. Data were analyzed for 17 pairs of drivers and children, observed more than ten times under identical conditions. Frequency of identical actions was analyzed on the basis of category systems, whereby a sequence of behavior was broken down into several items. A variety of individual differences and inter-behavioral differences in consistency were detected, and in general drivers were more consistent than children. Drivers' signals and accompanying of children were somewhat inconsistent, while some of their choice behaviors were very stable. Inconsistent behavior was discussed in terms of the lack of or insufficient specification of drivers' and children's schemas. Repeated naturalistic observation can not only identify behavioral consistency and reveal the structure of relevant schemas in daily life but also can predict behavior.