The purpose of this report is to describe the development of a pool of mathematical problem-solving situations and a set of items for each situation which provides information about students' qualitatively different levels of reasoning ability as applied to that situation. For each problem-solving situation, a set of "structured superitems" was developed. "Superitems" are a set of test items about a common situation or stem. Such item sets have been shown to be valid and useful for assessing mathematical problem solving. For the constructed item pool, a recently developed taxonomy based on the structure of the observed learning outcome (SOLO) was used as the basis for the development of the superitems. Four questions were written for each problem situation to assess five levels of reasoning concerning the situation. The superitems were administered in separate group tests to 300 students of 9, 11, 13, and 17 years of age. The 38 items in the final batteries were mathematically correct and were related to the levels of reasoning in the SOLO Taxonomy. This document focuses on the details of the preparation of the items prior to their administration. Instructions for judging items, manuals, and sample tests are appended. (Author/PN)