“…That is, the words should be highly intelligible and of equal difficulty. Keaster (1947) outlined a number of problems in accurately determining speech reception thresholds in children which are relevant concerns today: (1) the test must have sufficient appeal to maintain the child's attention long enough for threshold to be determined; (2) most young children have a brief attention span, requiring a rapid procedure; (3) since verbal comprehension is more highly developed than verbal production in small children, nonverbal responses are preferred; (4) neither the child's short memory span nor his ability to understand the task must be exceeded; and (5) test words must be within the child's vocabulary.…”