This study investigated teachers' perceptions of their students' behavior problems in nursery classes. A total of 154 female teachers from rural, small town, and urban areas in Greece completed a self-reporting questionnaire and an evaluation of their students' behavior. The overall prevalence rate identified by teachers for all behavior problems in their students was 14.3 percent, with 2.1 percent perceived as very serious. More boys than girls were perceived to have behavior problems in general, and conduct problems in particular. An almost equal percentage of boys and girls were perceived as showing serious emotional problems. While the gender, age, and academic achievement of the children, as well as the teacher's years of experience, were found to be significant factors, the socioeconomic status of the children was not. An appendix provides sample questions from the teacher questionnaire. Contains 49 references. (MDM)