A COMPARISON OF THE RELIABILITY AND VALIDITY OF TWO METHODS FOR ASSESSING PARTIAL KNOWLEDGE ON A MULTIPLE-CHOICE TEST

Differential weighting of response alternatives and confidence testing have been proposed as ways to assess partial knowledge on multiple-choice tests. 211 students in an educational measurement course took their midterm examination under one of three procedures. Results from those students administered the test under conventional directions provided a baseline for comparing, in terms of reliability and validity, the results from students who took the test under the differential weighting of response alternatives or the confidence testing instructions. Reliability was estimated by the split-half technique. Validity was estimated by correlating midterm test scores with scores on a final examination. This investigation provides some support for the contention that validity can be improved using more sophisticated testing techniques. Suggestions for the conduct of more definitive studies were offered.     

Violence in School: What Can We Do?

A common disruption to learning and stability in schools occurs when pupils fight or become aggressive. This paper considers the issues of anger management, violence control and fighting reduction through a counselling programme with a high-risk pupil in secondary school. It begins by examining some of the thinking on young people and violence and aggression. Then, the author considers the place of counselling in schools in relation to this issue. Interventions for the practitioner to consider are discussed, including how to make a clear diagnosis of the nature of violence for the particular youngster, an analysis of anger-triggers and an ambitious attempt to modify a belief-system that holds that 'might is right'. The author argues that occasional incidents of violent disruption are a reality in education, and while media reporting exaggerates the problem, schools need more imaginative strategies with the few targeted individuals than exclusion from school.     

Between the Lines: Philosophy, Text and Conversation

In doing philosophy we need to be aware of the awkwardness of thinking in terms of having a method, still more any kind of 'methodology'. Instead we might consider the different ways in which philosophy has been conceived in terms of contrasts: for example between the written and the spoken word, between exposition and dialogue, and between—in Richard Rorty's terms—systematic and edifying philosophy. This article offers no easy answer to how to proceed, suggesting rather that those who attempt philosophy need to be alert to the possibilities and dangers that lie on either side. This is not just any kind of alertness, but a matter of close reading rather than skimming, of carefully attending—listening—to those with whom we engage, whether they are people or texts.     

Geometry of screw compressor rotors and their tools

This paper presents a method of general geometrical definitions of screw machine rotors and their manufacturing tools. It describes the details of lobe shape specification, and focuses on a new lobe profile, which yields a larger cross-sectional area and shorter sealing lines resulting in higher delivery rates for the same tip speed. A well proven mathematical model was used to determine the optimum profile, compressor housing size, and compressor ports to achieve the superior compressors.