The strategy choice model (SCM) is a highly influential theory of human problem-solving. One strength of this theory is the allowance for both item and person variance to contribute to problem-solving outcomes, but this central tenet of the model has not been empirically tested. Explanatory item response theory (EIRT) provides an ideal approach to…

We investigated how the updating function supports the integration process in solving arithmetic word problems. In Experiment 1, we measured reading time, that is, translation and integration times, when undergraduate and graduate students (n = 78) were asked to solve 2 types of problems: those containing only necessary information and those…

Models of irregular word reading that take into account both child- and word-level predictors have not been evaluated in typically developing children and children with reading difficulty (RD). The purpose of the present study was to model individual differences in irregular word reading ability among 5th grade children (N = 170), oversampled for…

The current study explored individual differences in ability and motivation factors of retention in first-year college students. We used discrete-time survival mixture analysis to model university retention. Parents' education, gender, American College Test (ACT) scores, conscientiousness, and trait affectivity were explored as predictors of…

In the present study, we investigated critical factors in letter-sound acquisition (i.e., letter-name knowledge and phonological awareness) with data from 653 English-speaking kindergartners in the beginning of the year. We examined (a) the contribution of phonological awareness to facilitating letter-sound acquisition from letter names and (b)…

Longitudinal structural equation modeling was used to evaluate longitudinal relationships across adjacent grade levels 1 to 7 for levels of language in writing (Model 1, subword letter writing, word spelling, and text composing) or writing and reading (Model 2, subword letter writing and word spelling and reading; Model 3, word spelling and…

There is a growing literature demonstrating that speech rhythm sensitivity is related to children's reading development, independent of phonological awareness. However, the precise nature of this relationship is less well understood, and further research is warranted to investigate whether speech rhythm sensitivity predicts the different…

Using a model for individual differences in multidimensional scaling, 16 concepts dealing with developmental psychology were scaled before and after a course. The criterion measure used was the instructor's position in the subject space. Implications of this methodology for educational evaluation are discussed. (Author/SE)

An individual differences model of learning from instructional text was tested with 211 Air Force recruits. Results strongly supported the model, which suggests that learning from text is determined by making connections among ideas that include the text and prior learning. Making the connections depends on individual differences. (SLD)

To investigate the role expectation based rules governing formal reasoning performance, a battery of group and individual aptitude measures and formal reasoning tests were administered to 17-year-olds. Individual differences in usage of these rules were clarified by establishing an overlap between an aptitude model and formal reasoning.…

Several issues about component validity are examined by using covariance modeling to test hypotheses about the relationships between components, aptitude, and achievement. Support was found for cognitive components to model individual differences in verbal aptitude, decompose test validity, and differentially predict achievement. (Author/GK)

In three experiments, differences between good and poor writers were examined on six cognitive-processing tasks: ordered letters, ironic memory, letter reordering, word reordering, sentence reordering, and paragraph assembly. Both college and high school students were studied. Significant differences were found in abilities to hold and…

An information processing model was fitted to individual learning of paired associates and word definitions for 378 fifth to tenth-grade students. Reliable individual differences in acquisition rate and long-term retention were found. Correlations with traditional aptitude and achievement scores were discussed; no significant sex or ethnic group…

An information-processing model was tested for a laboratory visualization task that represents one adaptation of a standardized spatial ability test. The pattern of results suggests that individual differences are a function of differences in the accuracy and/or quality of the mental representation, not just speed of processing. (Author/BW)

The authors examined individual differences in reading development in English and Finnish. English-speaking Canadian children were assessed once per year in Grades 1-5, and Finnish children were assessed twice per year in Grades 1-2. Results from latent growth curve and simplex analyses showed that initial status was generally negatively…