Credentialing examination developers rely on task (job) analyses for establishing inventories of task and knowledge areas in which competency is required for safe and successful practice in target occupations. There are many ways in which task-related information may be gathered from practitioner ratings, each with its own advantage and…

This article discusses the use of the Many-Facets Rasch Model, via the FACETS computer program (Linacre, 2006a), to scale job/practice analysis survey data as well as to combine multiple rating scales into single composite weights representing the tasks' relative importance. Results from the Many-Facets Rasch Model are compared with those…

Presents a method for combining multiple scale responses from job or task surveys based on a hierarchical rating scheme. Provides the rationale for placing the resulting ordinal information on an interval scale of measurement using the Rasch model. Also suggests a method for linking two or more surveys using the Rasch model and the BIGSTEPS…

Job task analyses provide a link between job performance and examination content. This paper describes a methodology that uses Item Response Theory to place job task analysis data on an equal interval scale that allows for quantitative comparisons between tasks and provides a method for quantifying a test blueprint. An actual analysis was…

This article discusses the range of validation studies conducted in Kansas in examining the validity of the National Teachers' Examination as a certification test for that state. It is argued that the validation of certification tests calls for a wider range of studies than typically are undertaken. (JAZ)