In this paper we address the points raised by groups of scientists who were invited to respond to our initial critique of polychlorinated biphenyl (PCB) research in this special issue. In that article, we applied six objective criteria to more than two decades of published PCB research and concluded that much of the research was badly flawed. The…

This paper describes a classroom teaching experiment, concerning the concept of probability, with children aged 5 in a kindergarten school. The teaching experiment was based on constructivist and interactionist theories about the learning of school mathematics and lasted one month. The collection of the information was based on the tape-recorded…

If risk taking is in some measure a signal to others by the person taking risks, the model of "costly signaling" predicts that the more the apparent cost of the risk to others exceeds the perceived cost of the risk to the risk taker, the more attractive that risk will be as a signal. One hundred and twelve visitors to youth…

This article addresses the relationship between academic achievement and the student characteristics of absence and mobility. Mobility is a measure of how often a student changes schools. Absence is how often a student misses class. Standardized test scores are used as proxies for academic achievement. A model for the full joint distribution of…

The purpose of this article is to identify the difficulty of learning materials in the network by using learner's portfolio in the asynchronous learning system. Asynchronous learning takes the advantage of information technology that records the learning portfolio of the learner. The data of the learning portfolio reflects the characteristics of…

If you've ever thought that you should spend less time reacting to events and more time anticipating changes that lurk just around the corner, then here's a book that gives you the ideas and vision you need to be a future-focused leader. Drawing from demographic trends and timeless wisdom, author Gary Marx outfits you with a living strategy that…

This report describes how an innovative curriculum promoted the civic development of high school students along with parents by stimulating news media attention and discussion in families. Evidence is based on a three-year evaluation of Kids Voting USA, an interactive, election-based curriculum. Political communication in the home increased the…

This study uses Partial Credit Rasch analysis to study a complex data set of student responses to survey items relating to chance and data. The items were administered in the classroom and collected from 1993 to 2003 in the Australian state of Tasmania. Data were collected from a total of 5514 individual students across Grades 3 to 11 over the…

School counselors should be knowledgeable about the influence of today's technologies on common issues dealt with in counseling. This article describes several of these issues and how they are affected by use of technology. Suggestions are provided to help counselors deal with the current challenges posed by the use of interactive communication…

We examined the mediating role of family dynamics (marital quality, parental depression) in the link between economic pressure and child psychological functioning using the data from the National Survey of Family and Households (NSFH). From the initial multiethnic probability sample, we used a subsample of 2998 parents with a focal child 5 to 17…

Our primary goal is to design a micro world which aspires to research thinking-in-change about distribution. Our premise, in line with a constructivist approach and our prior research, is that thinking about distribution must develop from causal meanings already established. This study reports on a design research study of how students appear to…

Decades of education research have shown that students can simultaneously possess alternate knowledge frameworks and that the development and use of such knowledge are context dependent. As a result of extensive qualitative research, standardized multiple-choice tests such as Force Concept Inventory and Force-Motion Concept Evaluation tests…

Background: Bullying is a problem in schools in many countries. There would be a benefit in the availability of a psychometrically sound instrument for its measurement, for use by teachers and researchers. The Olweus Bully/Victim Questionnaire has been used in a number of studies but comprehensive evidence on its validity is not available. Aims:…

In this paper, absorbing markov chains are used to analyse the flows of higher degree by research candidates (doctoral and master) within an Australian faculty of business. The candidates are analysed according to whether they are full time or part time. The need for such analysis stemmed from what appeared to be a rather poor completion rate (as…

Using a prospective design spanning 17 years, the authors studied in a sample of 231 boys and girls the predictive links of verbal abuse by the teacher during childhood to high-school graduation and behavioral and emotional problems in young adulthood, as well as the putative mediating role of individuals' generalized and domain-specific…