(HCM) (Andrich & Luo, 1993). The Rasch model has a close conceptual relationship to Thurstone's law of comparative judgment (Andrich, 1978), the principal difference being that it directly incorporates a person parameter. Also, the Rasch model takes the form of a logistic function rather than a cumulative normal function. See also Thurstonian model Bogardus scale Guttman scale Likert scale Semantic differential Diamond of opposites References Andrich, D. (1978b) Relationships between the Thurstone and Rasch approaches to item scaling. Applied Psychological Measurement, 2, 449-460. Andrich, D. & Luo, G. (1993) A hyperbolic cosine model for unfolding dichotomous single-stimulus responses. Applied Psychological Measurement, 17, 253-276. Babbie, E., 'The Practice of Social Research', 10th edition, Wadsworth, Thomson Learning Inc., Edwards, A. L. Techniques of attitude scale construction. New York: Appleton-Century- Crofts, 1957. Guilford, J. P. Psychometric methods. New York: McGraw-Hill, 1954. Krus, D.J., & Kennedy, P.H. (1977) Normal scaling of dominance matrices: The domain-referenced model. Educational and Psychological Measurement, 37, 189-193 (Request reprint). Krus, D.J., Sherman, J.L., & Kennedy, P.H. (1977) Changing values over the last half-century: the story of Thurstone's crime scales. Psychological Reports, 40, 207-211 (Request reprint). Thurstone, L. L. (1927a) A Law of comparative judgment. Psychological Review, 34, 273-286. Thurstone, L. L. (1927b) The method of paired comparisons for social values. Journal of Abnormal and Social Psychology, 21, 384-400. Thurstone, L. L. (1928). Attitudes can be measured. ''American Journal of Sociology, 33, 529-54. Psychometrics Questionnaire construction Survey methodology