Self-presentation bias in surveys of teachers’ educational technology practices

This study investigated self-presentation bias in the self-reports of teachers about their practices in six topic areas in educational technology (Instructional Design, Assessment, Learner-Centered Instruction, Curriculum Alignment, Attitudes about Computers, and Use of Computers with Students). Subjects were 50 middle-school teachers. Data were collected using a 30-item Likert-type survey containing five items per topic area. Teachers responded to items in two forms: “what I do” and “what other teachers do.” Significant differences favoring the “I” form were obtained in three of the six areas (Instructional Design, Learner-Centered Instruction, and Curriculum Alignment) and on nine of the 30 items, indicating a rather strong self-presentation bias. Responses were generally positive across both forms. Results are discussed with implications for working with teachers and for using additional assessment measures that complement teacher self-reports.     

Children's Reactions to the Receipt of Direct and Indirect Help

First, third, and fifth graders' ( N = 201) reactions to 2 types of and (direct help [answers] and indirect help [hints]) commonly used by helpers to assist children were examined. The children were randomly assigned to receive either direct or indirect help on a task, and then were asked to try a similar task immediately and again a few days later. Direct help was expected to elicit dependency, whereas indirect help was expected to elicit independent reactions. Age and/or sociocognitive level were predicted to moderate the effects of help. Direct help resulted in feelings of threat, low perceived control, and high dependency help-seeking for girls, but not for boys. Boys who received indirect help and understood the notion of consistency of personality requested less dependent help than did boys with less of this sociocognitive skill. Moreover, children high in the understanding of consistency of personality were more autonomous (i.e., helped themselves more) in the indirect than in the direct help condition.     

Student drop‐out from a distance education project course: A new method of analysis

A study of student attributes and achievements in previous Open University courses was undertaken to find out what affect they had on the drop‐out rate and achievements on a project work course. A special case of multidimensional analysis called partial order scalogram analysis has been employed in this research.

The main aim of the study was to help the staff when advising prospective students (of various drop‐out risks) and to distinguish between students requiring different levels of assistance on the course.

The findings, based on a sample of 445 students from 1982–;88, indicate that particular attributes such as occupation affect the drop‐out rate, while achievement in the project course appears to be influenced by the students’ performance in some previous courses.     

Logit analysis of graduate student retention

A logit model is developed to predict the retention of graduate students. The use of the BMDP4F procedure to develop a logit model for graduation student retention is outlined, and the model is applied to data from a major university. In this study, predicted retention rates for master's students were independent of age and sex, but were a function of race/visa status, registration status, and the interactions between academic division and registration status and between academic division and race/visa status. Predicted rates for doctoral students were independent of age and race/visa status, but were a function of registration status, academic division, and the interactions between academic division and registration status and between academic division and sex.     

An Approach to Emissions Minimization in Power Dispatch

Pollution control strategies currently in use by electric power systems are reviewed and a new minimum emission dispatch (MED) method is developed. This new method minimizes overall emission levels at an increased cost in large-scale power systems while simultaneously accommodating local pollution level requirements, as well as economic constraints.     

A re-examination of relevance: toward a dynamic, situational definition*

Although relevance judgments are fundamental to the design and evaluation of all information retrieval systems, information scientists have not reached a consensus in defining the central concept of relevance. In this paper we ask two questions: What is the meaning of relevance? and What role does relevance play in information behavior? We attempt to address these questions by reviewing literature over the last 30 years that presents various views of relevance as topical, user-oriented, multidimensional, cognitive, and dynamic. We then discuss traditional assumptions on which most research in the field has been based and begin building a case for an approach to the problem of definition based on alternative assumptions. The dynamic, situational approach we suggest views the user — regardless of system — as the central and active determinant of the dimensions of relevance. We believe that relevance is a multidimensional concept; that it is dependent on both internal (cognitive) and external (situational) factors; that it is based on a dynamic human judgment process; and that it is a complex but systematic and measurable phenomenon.     

Lab-on-a-chip workshop activities for secondary school students

The ability to engage and inspire younger generations in novel areas of science is important for bringing new researchers into a burgeoning field, such as lab-on-a-chip. We recently held a lab-on-a-chip workshop for secondary school students, for which we developed a number of hands-on activities that explained various aspects of microfluidic technology, including fabrication (milling and moulding of microfluidic devices, and wax printing of microfluidic paper-based analytical devices, so-called μPADs), flow regimes (gradient formation via diffusive mixing), and applications (tissue analysis and μPADs). Questionnaires completed by the students indicated that they found the workshop both interesting and informative, with all activities proving successful, while providing feedback that could be incorporated into later iterations of the event.