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Development of the Tower of London-Revised

Geoffrey M. Schnirman

Marilyn C. Welsh

Paul D. Retzlaff

University of Northern Colorado

The objective of this work was to reconstruct the Tower of London (TOL) test in order to increase its reliability. A three-phase process was undertaken to accomplish this goal. In Phase 1, the TOL item pool was increased, the task was administered to a sample of college students (N = 50), and item-total correlations were calculated in order to identify the items that had the highest correlation with the total score. In Phase 2, the revised 30-item TOL (TOL-R) was administered to a second sample (N = 50) and the internal consistency reliability (Chronbach alpha) was estimated at .794. Finally, Phase 3 examined the test-retest reliability of the TOH-R on a new sample (N = 34) and the stability was found to be acceptable at r = .70.

Key Words: Neuropsychology • psychometrics • Tower of London • executive function • planning

Assessment, Vol. 5, No. 4, 355-360 (1998)
DOI: 10.1177/107319119800500404
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