In foundation biochemistry and biological chemistry courses, a major problem area that has been identified is students' lack of understanding of pH, acids, bases, and buffers and their inability to apply their knowledge in solving acid/base problems. The aim of this study was to explore students' conceptions of pH and their ability to solve…

Cognitive load can be defined as the amount of mental effort that performing a specific task imposes on a learner's cognitive system. It can be measured by the number of new concepts embedded in a learning task. English as a Foreign Language (EFL) learners, with their limited English proficiency and minimal entry knowledge of a subject matter,…

Introduction: In this paper we investigate how students' class grades are affected by individual differences in circadian rhythm, class time-of-day and class difficulty. Method: Using a sample of university students, we assessed morningness and eveningness personality type, and then obtained students recalled classes as well as their…

This paper explores alternative approaches for facilitating efficient, evidence-centered item development for a new type of verbal reasoning item developed for use on the GRE® General Test. Results obtained in two separate studies are reported. The first study documented the development and validation of a fully automated approach for locating the…

This paper analyses the effects of manipulating the cognitive complexity of L2 oral tasks on language production. It specifically focuses on self-repairs, which are taken as a measure of accuracy since they denote both attention to form and an attempt at being accurate. By means of a repeated measures design, 42 lower-intermediate students were…

The research reported in the current article studies the impact of learning in asynchronous discussion groups on students' final exam scores and levels of knowledge construction. Multilevel analyses were applied to uncover the specific influence of student, group and task variables. The results indicate that the impact of student characteristics…

The purpose of this study was to determine whether it is both possible and cost-effective to revise middle-difficulty Graduate Record Examinations (GRE) discrete items in order to produce items of higher or lower difficulty. The basic procedure was to select items of a given difficulty and, by revising the distractors, make them easier or more…

The possibility exists that some people might be at a disadvantage in registering their responses to a computerized test if mouse manipulation were complicated. This would be of particular concern if some groups were differentially affected by the complexity of manipulation. This study analyzed data from a pilot test conducted in 1991 for the…

Two-stage and multistage test designs provide a way of roughly adapting item difficulty to test-taker ability. All test takers take a parallel stage-one test, and, based on their scores, they are routed to tests of different difficulty levels in subsequent stages. These designs provide some of the benefits of standard computerized adaptive testing…

The first of two studies reported examined the factors that predict differences in item responses for black and white matched examinees to analogies on the Graduate Record Examinations (GRE). Data were taken from 13 forms of the GRE Verbal Test, with a median sample size of 21,000 whites and a median sample size of 1,400 blacks for the purpose of…

The guide contains original and innovative ways to use literature in the second language classroom. The lesson ideas, contributed by teachers, are intended for varied age levels, from young children to graduate students, and come from teachers in all parts of the world. The ideas are divided into four chapters: "Prose"; "Poetry"; "Drama"; and…

A discussion of the relationship of vocabulary to reading comprehension focuses on the instruction of difficult vocabulary to learners of English as a Second Language. The historical background of vocabulary instruction is chronicled and the importance of reading and vocabulary learning to each other is examined. Various kinds of difficult…

Academic records of first year students enrolled in Introductory Chemistry at the University of Guelph, Canada, were used to develop a method to examine the effects of individual courses on freshman academic performance. At the center of the technique is a new test statistic useful in creating individual course profiles. Because grade point…

This Monte Carlo study examined strategies for forming the matching variable for the Mantel-Haenszel (MH) differential item functioning (DIF) procedure. Data were generated using a three-parameter logistic item response theory model, with common guessing parameters. The number of subjects and test length were manipulated, as were the difficulty,…

Ease of language processing varies with the nature of the language involved. Ordinary spoken language is the easiest kind to produce and understand, while writing is a relatively new development. On thoughtful inspection, the readability of writing has shown itself to be a complex topic requiring insights from many academic disciplines and…