A cordless mouse with an added reed switch is used as a wireless data logger to record every time the wheel of a trolley completes a revolution. The limitations of the system in terms of maximum clicking rate and spatial resolution are considered and data obtained from the descent of a trolley down a ramp at various different angles is analysed in…

Mantel-Haenszel (MH) methods constitute one of the most popular nonparametric differential item functioning (DIF) detection procedures. GMHDIF has been developed to provide an easy-to-use program for conducting DIF analyses. Some of the advantages of this program are that (a) it performs two-stage DIF analyses in multiple groups simultaneously;…

Discusses recordable digital video discs (DVD-R), highlighting technology, comparing DVD-R and recordable compact discs (CD-R); expected life of media; compatibility; recording process; recording time; applications: testing and development, distribution, storage and archival; and future developments. (PEN)

Discusses accessing the Internet via satellite with the Hughes Network Systems DirecPC satellite dish, focusing on applications for satellite dishes, pricing, how it works, siting and hardware requirements, disadvantages, security issues, and availability. Provides tips for enhancing DirecPC speed and compares DirecPC and integrated services…

Discusses personal computer price trends since 1986; describes offerings and prices for four direct-market suppliers, i.e., Dell CompuAdd, PC Brand, and Gateway 2000; and discusses overall value and price/performance ratios. Tables and graphs chart value over time. (EA)

The authors of this article coordinate and teach different core subjects within a course of preservice teacher education in the Faculty of Education, University of Melbourne, Australia. Both subjects are obligatory, and are taught to the same cohort of students. The first author coordinates the subject Learning and Teaching; the second author…

The three articles in this special section on document image files discuss intelligent character recognition, including comparison with optical character recognition; selection of displays for document image processing, focusing on paperlike displays; and imaging hardware, software, and vendors, including guidelines for system selection. (MES)