This paper on readability begins with a brief discussion of comprehension, including a definition, and then lists factors that influence comprehension, such as knowledge of vocabulary, long passages that are ambiguous, digressions, and unnecessary restatements. The paper then explores readability and presents a graph for estimating readability and instructions for using it. Finally, the paper focuses on cloze procedure, explains when and why cloze procedure can be used, and gives directions for constructing, administering, and scoring a cloze test. (TJ)