The present guide provides a practical guide to conducting latent profile analysis (LPA) in the Mplus software system. This guide is intended for researchers familiar with some latent variable modeling but not LPA specifically. A general procedure for conducting LPA is provided in six steps: (a) data inspection, (b) iterative evaluation of models,…

Choosing whether to test via computer is the most difficult and consequential decision the designers of a testing program can make. The decision is difficult because of the wide range of choices available. Designers can choose where and how often the test is made available, how the test items look and function, how those items are combined into…

Examines factors affecting selection and development of computer simulations, including type of learner, simulation formats, instructional purposes, learning outcomes, fidelity, learning stages, and logistical issues. A flowchart model and set of prescriptions to help designers arrive at specifications for an instructional simulation are…

A tutorial introduction to data models in general is provided, with particular emphasis on the relational and network models defined by the two proposed ANSI (American National Standards Institute) database language standards. Examples based on the network and relational models include specific syntax and semantics, while examples from the other…

Shocked by static? Mixed up about magnets? Curious about currents? Teachers can get past memorizing all those electricity-related formulas, rules, and procedures so they can understand the subject at a level deep enough to teach it with confidence and comfort. Here to help is "Electricity and Magnetism," the fifth title in the award-winning NSTA…

This guide discusses the essentials of live virtual reference, preparing for virtual reference, and implementing and incorporating virtual reference. Chapter 1, "Understanding Live Virtual Reference," lays out what virtual reference is and how it compares to other forms of reference. Chapter 2, "Offering Live Virtual Reference," presents ten…

Suggests a model for using a spreadsheet to allocate academic library salary increases. Seven variables are incorporated in the model: (1) experience; (2) difficulty of the job; (3) initiative; (4) cost of living; (5) inflation; (6) equity; and (7) merit. One reference is listed. (MES)

Developed to identify and qualitatively assess computer system evaluation techniques for use during acquisition of general purpose computer systems, this document presents several criteria for comparison and selection. An introduction discusses the automatic data processing (ADP) acquisition process and the need to plan for uncertainty through…

This paper discusses the factors involved in making decisions about a multimedia display system. Theoretical factors, including gaining and holding learner attention, specific attention-getting devices, encoding and retrieval of information by learners, and presentation of information are considered. Ways that video is associated with computer…

Presents a planning model for the automation of operations in a large hospital library and specifically describes the design and implementation of a local area network. Part 1 deals with the evolution of the idea, system planning, and design, and Part 2 addresses installation and implementation issues. (EM)