THE NATURE OF OBJECTIVITY WITH THE RASCH MODEL

Although it has been claimed that the Rasch model leads to a higher degree of objectivity in measurement than has been previously possible, this model has had little impact on test development. Population-invariant item and ability calibrations, together with the statistical equivalency of any two item subsets, are supposedly possible if the item pool has been calibrated by the Rasch model. Initial research has been encouraging, but the implications of underlying assumptions and operational computations in the Rasch model for trait theory have not been clear from previous work. The current paper presents an analysis of the conditions under which the claims of objectivity will be substantiated, with special emphasis on the nature of equivalent forms. It is concluded that the real advantages of the Rasch model will not be apparent until the technology of trait measurement becomes more sophisticated.     

Contributions and Limitations in the Use of Computers in Counselor Training

This article examines the role of computer technology in counselor preparation. Three aspects of counselor training—acquisition of facts and theory, development of specific skills, and personal and professional development—are discussed in terms of the potential contributions and limitations of computers in training efforts.     

Impact of National Aquarium in Baltimore on Visitors' Conservation Attitudes,Behavior, and Knowledge

This study at the National Aquarium in Baltimore (NAIB) was conducted to assess four key aspects of the visitor experience: (1) incoming conservation knowledge, attitudes, and behavior of NAIB visitors; (2) patterns of use and interaction with exhibition components throughout the NAIB; (3) exiting conservation knowledge, attitudes, and behaviors of visitors; and (4) over time, how the NAIB experience altered or affected individuals' conservation knowledge, attitudes, and behaviors. Three hundred six visitors participated in the study, which was conducted from March through July, 1999. The study utilized four data‐collection techniques: (1) face‐to‐face interviews, (2) Personal Meaning Mapping (PMM), (3) tracking, and (4) follow‐up telephone interviews. Participants were a self‐selected population and were generally more knowledgeable about, more concerned about, and more involved in conservation‐related issues than the general public. However, they were far from conservationists. Visitors in this study clearly absorbed the fundamental conservation message at the NAIB. In fact, the NAIB visit appeared to focus visitors' conservation‐related thoughts, while also broadening their understanding of conservation. Changes in visitors' conservation knowledge, understanding, and interests by and large persisted over six to eight weeks after visiting NAIB. The NAIB experience also connected to visitors' lives in a variety of ways following their visit. However, these personal experiences rarely resulted in new conservation actions. In fact, their enthusiasm and emotional commitment to conservation (inspired during the NAIB visit) generally fell back to original levels, presumably in the absence of reinforcing experiences. The findings of this study are guiding subsequent investigations at the NAIB. More generally, the results suggest strategies to enhance current understanding of the impact free‐choice learning institutions have on their visiting public.     

IMPLICATIONS OF CRITERION-REFERENCED MEASUREMENT1,2

During the past several years measurement and instructional specialists have distinguished between norm-referenced and criterion-referenced approaches to measurement. More traditional, a norm-referenced measure is used to identify an individual's performance in relation to the performance of others on the same measure. A criterion-referenced test is used to identify an individual's status with respect to an established standard of performance. This discussion examines the implications of these two approaches to measurement, particularly criterion-referenced measurement, with respect to variability, item construction, reliability, validity, item analysis, reporting, and interpretation.     

Effects of Low-level Counselor Functioning on Clients

Three counselors identified as functioning at a low level on basic facilitative skills were paired with both a high- and a low-level functioning client for three sessions. Functioning levels for both counselors and clients were determined by appropriate rating scales. The results indicated negative change in interpersonal functioning levels on the part of high-level clients and no significant change on the part of low-level clients.     

CLIENT 1: A Computer Simulation for Use in Counselor Education and Research

CLIENT 1 is an interactive program that was designed to simulate client behavior in an initial interview and to provide a standardized environment for training and research on counselor problem-solving strategies. Through interaction with the computerized client, counselors attempt to facilitate client movement toward the goal of verbalizing a specific problem statement. Client movement is a function of the appropriateness and accuracy of counselor statements, the threat value associated with both client and counselor statements, the strength of the relationship between the counselor and client, and an index of counselor expertise. The uses of the simulation in counselor education and research are discussed.