Designed to analyze systematically the relative effects of different types of oral reading errors on comprehension, this instrument consists of a basic set (each with an easy and a hard version) of six stories. Every story is transformed so that it contains simulated errors of a particular type: (1) correct, (2) semantically related visually unrelated, (3) semantically unrelated visually related, (4) semantically and visually unrelated, (5) no response, and (6) mixed simulate type. After reading each story, subjects answer six cloze-type questions and two additional questions designed to test inferential comprehension. (This document is one of those reviewed in The Research Instruments Project (TRIP) monograph "Measures for Research and Evaluation in the English Language Arts, Volume 2," published by the Committee on Research of the National Council of Teachers of English in cooperation with the ERIC Clearinghouse on Reading and Communication Skills. The TRIP review, included here as an introduction to the instrument, describes the instrument's category (reading), title, author, date, age range (primary, upper elementary), purpose, and physical characteristics.) (JL)