As an estimate of probability of readability is discussed within the problem of ensuring that science tests meet the purposes of measuring skills, knowledge and ability of students. The necessity of technical terms is cited while arguing that testing for language should not interfere with tests for knowledge and skills. A review of formulas for…

To what extent can photographic readability be formalized for use as a criterion in the evaluation of instructional materials? The purpose of this study was to develop and pilot test a readability index for evaluating photographic illustrations in instructional materials. The index uses an interdisciplinary battery of methods adapted from the…