Sunday, October 23, 2011: 2:00 PM
Buckingham (Hyatt Regency Chicago)
Course Type: Half Day
Course Level: Intermediate

Format Requirements: The format is lecture / discussion and there are no prerequisites for the course.

Background: The Lens Model of judgment has been developed over the past 60 years beginning with the concepts of Egon Brunswik and refined and applied to judgments made in many fields by Ken Hammond and colleagues. Also called Judgment Analysis, the lens model is a method for describing and analyzing the use of observations (cues) by judges or decision makers and comparing them to the optimal use of cues in the environment. It has had many productive applications to medical decision making.

Description and Objectives: This course will show how to apply judgment analysis to medical problems and determine the accuracy of the judgments made and how the clinical findings were used to reach the diagnostic or management judgements. We will show how to construct linear models of the judgments made and to analyze optimal use of the same cues in the environment. We will also introduce the lens model equation which allows detailed examination of sources of judgment error..The course will also cover other aspects of Brunswikian theory that relate to understanding of medical judgment with examples from the medical decision making literature.


Learn how to conduct a basic lens model study

Understand the components of the lens model equation and how they relate to judgment accuracy

Review the advances that have been made with the applications of judgment analysis and social judgment theory to the study of judgment and decision making.

Understand the elements of Brunswik’s probabilistic view of perception and how these have be extended to an understanding of medical judgment.

Learn how the concepts of coherence and correspondence and explain many scientific controversies.

Course Director:
Robert Wigton, MD, MS
Course Faculty:
Thomas G. Tape, M.D and Esther Kaufmann, PhD