The Booker profiles consist of: numeration (104 items covering aspects of numeration for whole numbers up to seven digits); and computation (184 items covering three concept items, 20 basic fact items, 20 algorithms, and 3 problem-solving items per operation). The material has been designed to identify and describe the origin of students' errors. The final profile analysis may demonstrate that although certain skill areas are present, the student does not know how to apply these skills and shows a lack of concept and/or process. The profile then provides direction for programming and remediation.