The overidentification of structural equation models with latent variables is discussed. The use of two- and three-indicator models is not recommended since such models do not allow a testing of the crucial assumption of unidimensionality among indicators in most cases. Models with four or more indicators may be more sensitive to departures from…

Discussion of the display of instructional text and text format elements focuses on a study of fourth graders that was conducted to test the effects of plain and enhanced screen designs on learning and time during computer-assisted instruction (CAI). Implications for screen design and future research are suggested. (31 references) (LRW)

Describes a study conducted at the University of Groningen (Netherlands) that investigated the effectiveness of a computer-based training program for use with an automated system for retrieving legal information. Hypotheses tested are explained, computer-based versus traditional instructional methods are compared, and implications for further…

Describes a study that examined the evolution of students' perceptions in grades 4 through 10 concerning computers over the course of 3 years. The use of Clark's concept of media attributions is explained; and results related to the three dependent variables of preference, perceived learning, and perceived difficulty are reported. (32 references)…