One of the first steps toward meeting the educational needs of the increasing number of students who display high risk behaviours is to identify who these students are and how many exist in public school classrooms. The purpose of the present study was twofold in nature: (a) to use teacher ratings to determine the proportion of students who were judged to be high risk for academic and social behaviour failure; and (b) to determine the efficiency and accuracy with which a screening instrument, the High Risk Screening Survey, could determine the proportion of students judged to be high risk. This paper provides a preliminary examination of the usefulness and efficiency of teacher reports and the High Risk Screening Survey. Three hundred and nine teachers, representing 29 schools in a large metropolitan area in Western Australia, rated 8,722 students in preschool and first through seventh grades. Preliminary field validation results indicated that the High Risk Screening Survey appeared to be an efficient, useful, and descriptive tool for assessing the general risk status of students in preschool and grades one through seven. In addition, across seven variables, most students were seen by their teachers as about or above average; in reading, math, and language arts, approximately 7% of all students were judged by their teachers as significantly behind their peers; and in self-management and social interactions with peers and adults, approximately 2% of students were judged by their teachers as significantly behind their peers. Additional findings, limitations, and recommendations are discussed.