Preparation of this paper supported by U.S. Public Health Grant HD-0890, a grant from the Carenegie Corporation, and by U.S. Public Health Grant HD-2680.

A method of investigating for possible bias in test items is proposed that uses analysis of variance for item data based on groups that have been selected to have identical test score distributions. The item data used are arcsin transformations of item difficulties. The methodological procedure has the following advantages: (1) The arcsin…

This paper reviews research on pictorial stimulus complexity in instructional materials, examining still iconic visuals in particular. Five phases are proposed to assist in the integration of this research for generating useful hypotheses: (1) establishment of methodological and conceptual criteria; (2) collection of relevant literature; (3)…

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Forty adults served as subjects in a study of the comprehensibility of instructions conditioned by multicategory compounds, such as "If you are male, or both married and not employed, go to question 3." The stimulus materials were 96 sentence frames of the form, "If you are X, press (button) Y," in which "X" was…

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Angoff's method for identifying possible biased test items was applied to four computer-generated hypothetical tests, two of which contained no biased items and two of which contained a few biased items. The tests were generated to match specifications of a latent trait model. Angoff's method compared item difficulty estimates for two different…

Three different experiments were conducted to examine several variables that influence the recall of prose. In Experiment I a study was made of the influence of differing imagery level nouns as the subject and object of the preposition of a sentence; it also provided a further test of the conceptual peg model, i.e., the concrete-concrete-subject…

Combinatorial and implicative operations were studied with tasks which eliminated many complexities found in Piagetian tasks, but which did not alter the logical strategies required by Piaget's task. Task difficulty in relation to information-processing demands of tasks and processing capacities of subjects at three age levels (8.0-10.1 and…

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This study sought (1) to discover ways to teach kindergarten children to listen to a rule that defines a concept and then to apply it, and (2) to learn if rule-learning is facilitated when the pupil is required to verbalize the rule while using it. The task used in the study (1) involves deductive reasoning, (2) requires rule utilization rather…

The Wisconsin model of conceptual learning and development specifies four levels of mastery in the acquisition of a concept. The levels of mastery are defined in terms of performance on tasks designed to measure each level. This paper discusses the internal operations or processes which are inferred as the mechanisms by which each level of…

Two experiments were performed using messages of digits presented auditorily at a rate of two digits per second. In both experiments, messages of seven different lengths were employed, consisting of 4 to 10 digits in Experiment 1, and of 2 to 8 digits in Experiment 2. The Ss were asked to recall them in the original order, and then to estimate the…