Content Validity Revisited

Abstract

This article describes a process for linking job analysis data to test specifications. Rasch rating scale analysis is used to order the ratings of importance assigned to task and content items by practicing laboratory managers. This ordering produces variables representing the range of task and content items from most to least important. The variables also provide an objective frame of reference for review of the data by the experts. The Rasch calibrations for each task and content item are transformed to percentages based on useful limits. From the transformed percentages, test specifications reflecting practice patterns in the field of laboratory management are developed.