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Biographical Memoirs: Volume 62

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Biographical Memoirs: Volume 62 JOY PAUL GUILFORD March 7, 1897-November 26, 1987 BY ANDREW L. COMREY J.P. GUILFORD died at the age of ninety in Los Angeles on November 26, 1987, after a long series of debilitating illnesses. He is survived by his wife, Ruth; his daughter, Joan S. McGuire; three grandchildren; and three great-grandchildren. He was born on a farm near Marquette, Nebraska, on March 7, 1897, the son of Edwin and Arvilla Monroe Guilford. In 1914 he was graduated from Aurora High School as valedictorian of his class. After teaching elementary school for two years, he attended the University of Nebraska for a year, entered the Army as a private, and after being discharged returned to complete his B.A. and M.A. at Nebraska. During this period he served as interim director of the Psychology Clinic, where he administered intelligence tests to children. He was impressed with the unevenness of children's abilities in different areas, something he had already noticed while comparing his own and his brother's aptitudes. He became convinced that intelligence was not one monolithic, global attribute but a composite of different abilities. At this point in his training, therefore, he was already showing a strong interest in what was to be the dominant focus of his professional career—individual differences. In 1924 Guilford entered the psychology Ph.D. program

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Biographical Memoirs: Volume 62 at Cornell University, where he studied with such famous historical figures as E. B. Titchener, Kurt Koffka, Harry Helson, and Karl Dallenbach. When Guilford was awarded the Ph.D. at Cornell in 1927, he had already published five papers. His doctoral thesis showed that variations in reported sensory experience with weak stimuli were due more to the characteristics of the limen itself than to fluctuations in attention, contrary to what was commonly believed at that time. After short periods of time on the faculties of the universities of Illinois and Kansas, Guilford returned in 1928 to the University of Nebraska as professor of psychology, where he achieved an international reputation as one of America's foremost psychologists. In 1940 he moved to the University of Southern California. Except for a period of leave to serve in the U.S. Army Air Corps during World War II, he remained at USC until his formal retirement in 1962. This event represented little more than a milestone in his career since he continued to be very active in research and writing for twenty-five more years. As a teacher, Guilford trained dozens of graduate students who went on to make numerous contributions of their own to the psychometric literature. During a productive research career that continued for more than six decades, Guilford published over twenty-five books, thirty tests, and 300 journal articles. Some of the honors and awards bestowed upon him include the following: president, the Psychometric Society (1938); president, the Midwestern Psychological Association (1939); president, the Western Psychological Association (1946); president, APA Division 5, Evaluation and Measurement (1947); president, the American Psychological Association (1949); president, APA Division 10, Aesthetics (1956); Legion of Merit for outstanding military service (1946); honorary degrees

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Biographical Memoirs: Volume 62 from the University of Nebraska (1952) and the University of Southern California (1962); membership in the National Academy of Sciences (1954); the APA Distinguished Scientific Contributions Award (1964); the Richardson Creativity Award (1966); president-for-life, the International Society for Intelligence Education (1978); and the Gold Medal of the American Psychological Foundation (1983). During the early years of his career, Guilford focused on such classical research topics in experimental psychology as attention, psychophysics, autokinetic phenomena, eye movements, scaling methods, and the phi phenomenon. The crowning achievement of this period, however, was the publication in 1936 of his classic textbook, Psychometric Methods, revised in 1954. This book became required reading for practically all psychology graduate students for decades and provided for the first time in one source an encyclopedic but readable exposition of psychophysical methods, scaling procedures, and even factor analysis. After publication of the book, the focus of Guilford's research shifted more and more to the study of personality and ability traits. L. L. Thurstone's Vectors of Mind, published in 1934, and related work on primary mental abilities provided a methodology that Guilford immediately began to apply to the study of personality. At the time, Carl Jung's extraversion-introversion construct was widely believed to represent a single unitary dimension of personality. Guilford and his wife, Ruth, developed thirty-five questionnaire items to measure attributes commonly assumed to represent extraversion-introversion and subjected them to a factor analysis using Thurstone's new method. They demonstrated that extraversion-introversion was not one global trait but a complex composite of several distinct personality attributes. This influential investigation was quickly followed by

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Biographical Memoirs: Volume 62 many other empirical studies of a similar kind, which led to the identification of thirteen important factors of personality. Three of these were measured in the first published factored personality inventory, the Nebraska Personality Inventory (1934). This line of research culminated in the publication of the well-known Guilford-Zimmerman Temperament Survey (1949) and a scholarly book reviewing the personality literature from the factor analytic point of view, Personality (1959). Guilford's new emphasis on correlational studies prompted him to give increased attention to statistical methods in his research and writing. In addition to developing many new statistical procedures of his own, in 1942 he published Fundamental Statistics in Psychology and Education, a popular textbook that was revised many times thereafter and is still in print today. The arrival of World War II presented Guilford with a unique opportunity to apply his factor analytic methodology to the study of mental abilities. He had always believed that there are many important and relatively independent mental abilities. So, when he was asked to participate in the U.S. Army Air Corps World War II research effort to develop psychological tests for the selection of pilots, bombardiers, and navigators, he had a philosophy and a methodology ready to apply to the task at hand. From 1942 through 1945 he directed a factor analytically oriented test development effort that dwarfed anything of the kind hitherto undertaken. He revolutionized job classification methods by factor analyzing performance criteria along with the tests themselves to provide more information about the aptitudes necessary for successful job performance. By the end of World War II, Guilford and his collaborators had identified and measured some twenty-five important mental ability factors. They used the

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Biographical Memoirs: Volume 62 psychological tests developed in this research effort as selection devices to reduce the failure rate in pilot training to one-third of what it had been at the start of the war. This epic work, described in his book Printed Classification Tests (1947), set the standard for all subsequent selection programs both in and out of the military. In 1945, Guilford returned to teaching and research at the University of Southern California, where he continued with his investigations into the mental abilities that make up intelligence. Guilford was particularly aware of the absence of creativity measures in conventional intelligence tests. His 1950 APA presidential address emphasized the need for more research into the nature of creativity. Over the next twenty years he carried out numerous large empirical investigations that continued to expand the number of confirmed mental abilities. Many of these were related to creativity. Two major books on intelligence emerged from this period, The Nature of Human Intelligence (1967) and The Analysis of Intelligence (1971) (with Ralph Hoepfner). By the early 1950s Guilford began to feel the need to develop a system for classifying the many mental abilities that had been and were continuing to be discovered. The first version of his now-famous Structure of Intellect (SOI) model was presented in 1955 to an international conference on factor analysis in Paris. From its first formulation, the SOI model became the main focus of Guilford's research and writing. He used the model to suggest where new abilities might be discovered, much as the periodic table had been used earlier to locate new chemical elements. The number of possible abilities represented by the model has increased over the years, and in the latest version (described below) there are 180. As the SOI model developed, Guilford became more and more interested in applying it to improve education.

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Biographical Memoirs: Volume 62 Despite the widespread popularity of the IQ Guilford never believed in the Spearman g-factor theory of intelligence, which implied that the IQ is based on a single monolithic ability trait. Furthermore, anticipating much recent controversy about the IQ concept, he doubted the immutability of mental ability. He believed that human abilities are differentiated into increasingly complex systems as a function of more and more education. He believed that children can be trained to be smarter; ''Intelligence education is intelligent education" became his motto. His ideas in this area have been implemented in recent years, particularly in Japan, through the efforts of the International Society for Intelligence Education. This society and its affiliated schools rest on the foundation of Guilford's SOI model. In these schools students are trained, from an early age, to upgrade their SOI abilities in thinking, creativity, and many other areas through weekly exercises. In recognition of Guilford's enormous contributions to education, the International Society for Intelligence Education, headquartered in Tokyo, published in 1988 An Odyssey of the SOI Model, edited by A. Chiba. This volume contains Guilford's autobiography, several of his papers on the SOI model, tributes to Guilford by his daughter and others, many of his letters, a vita, and Guilford's bibliography as edited by his wife. In his final version of the SOI, "Some Changes in the Structure-of-Intellect Model" (Educational and Psychological Measurement, 1988, vol. 48, pp. 1-4), Guilford described intelligence as being a systematic collection of a large number of abilities for processing different kinds of information in various ways. There are six kinds of operations (cognition, memory recording, memory retention, convergent production, divergent production, and evaluation); five kinds of contents (visual, auditory, symbolic, semantic, and behavioral); and six kinds of products (units, classes, relations,

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Biographical Memoirs: Volume 62 systems, transformations, and implications). The SOI model resembles a cube with contents, products, and operations each occupying one side. Each ability is defined by a conjunction of the three categories, occupying one cell in the three-dimensional figure. Many of these abilities are acknowledged to be correlated with each other. This 6 x 5 x 6 figure yields a total of 180 possible unique abilities, over 100 of which have been empirically verified. It is not easy to single out one achievement as Guilford's most important contribution. His outstanding books on psychometric methods, statistics, personality, and intelligence; his personality and ability tests; his U.S. Air Corps personnel selection work; his discovery of new mental abilities; and his SOI model have all been extremely influential. What may be most enduring, however, is his influence on our way of thinking about intelligence. When Guilford began his career, intelligence was the IQ a monolithic global trait that was regarded as largely innate and immutable. Now, in large measure as a result of his research, intelligence has been shown to be incredibly complex. There may be as many as 180 separate abilities that can be individually developed through "intelligence education." The hereditary limitations placed on human intelligence are seen now to be far less restrictive than previously assumed. Guilford's conception of intelligence, if adequately heeded, will have a profound impact in the future on public perceptions about individual potential and upon the education of children. A list of Guilford's accomplishments, impressive as they are, conveys very little about the man himself. What was he like? The following description of "J. P." is based on input from many different sources—family, friends, colleagues, students, acquaintances, and the writer's own personal contacts with him.

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Biographical Memoirs: Volume 62 Words that come quickly to mind to describe J. P. Guilford the man are integrity, honor, dedication, devotion, kindness, fairness, patience, generosity, loyalty, dependability, and emotional stability. He worked with a great many people and had many work under his supervision. I have known many of these people personally, and I have never heard one word of criticism about the way J. P. treated them. He was always scrupulously honest and fair about giving credit where credit was due. Those who knew him could not imagine that he would ever do anything unethical, dishonest, or unfair, and, as far as I know, he never did. Others may have achieved national and international recognition by questionable means—politics, connivance, connections, maneuvering, exploitation, outright dishonesty, and so on—but in J.P.'s case every bit of it was earned fairly and squarely through inspiration, hard work, and honest achievement. Many others have achieved fame and distinction in their work but at the cost of making a shambles of their personal life. Guilford, in contrast, was a devoted family man who loved, and in return enjoyed the lifelong love and devotion of, his one and only wife, their only daughter, and her three children. J. P. gave his wife a great deal of credit for what he was able to accomplish since she took on many responsibilities that otherwise might have distracted him from his career. In writing about her father in An Odyssey of the SOI Model, Joan S. Guilford paints a glowing portrait of the "daddy" she idolized who was always available to her, concerned about her welfare and happiness, helped her, and made her feel loved and respected. Few fathers could expect to receive such an appreciative tribute from their offspring, especially those fathers whose days had been so filled with work and heavy responsibilities. This tribute from a family member is mirrored, if in a less dramatic way, by innumerable examples of a caring

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Biographical Memoirs: Volume 62 concern that Guilford showed toward all those with whom he was in close contact. He was never too busy to listen to someone's problem, to help out a student who was having difficulty, or to write a carefully composed letter of recommendation for someone who was trying to get a job or promotion. To mention only a couple of incidents, J. P. once wrote a sizeable personal check to a volunteer research associate to enable that person to represent himself as a paid member of Guilford's staff while making a trip around the country to contact important figures in the field. In another case a student relates how Dr. Guilford used a gentle, guiding question to rescue him from an embarrassing moment during his final orals when he was having difficulty with some equations. Although he liked people and enjoyed being with them, Guilford was not gregarious or especially adept socially. He was very quiet and at times almost invisible, so much so that he was known by some of his U.S. Army subordinates as the "gray ghost." He would have liked to have been "one of the boys," but, although he had a few good friends, a basic shyness made it difficult for him to develop an easy camaraderie with others. The friends he had were usually professional colleagues who shared his interests and values. Raymond B. Cattell, in a personal communication, wrote, ''Nevertheless, we soon became trusted friends, as he stood up like a rock for basic research amidst an endless flurry of fashionable nothings." There was usually a somewhat awkward formality between Guilford and those around him, which neither wanted nor quite knew how to dispel. Few felt comfortable addressing him by anything other than "Doctor Guilford" or "Professor Guilford," even after decades of association. This formality was certainly not out of any fear of a negative reaction on his part. He was always most reluctant to criticize

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Biographical Memoirs: Volume 62 any student or subordinate, however much they might have deserved it, and was always very considerate and kind if he had to suggest any modification of others' behavior. I never saw him in an angry mood, and I never heard of him raising his voice to anyone. His disposition was always one of quiet friendliness and emotional calm. His daughter said about him that he evoked a kind of fear in her, "not because of any expectation of being punished or rejected, but rather from the possibility of disappointing an idol." I suspect that many others shared a similar feeling. Although he was somewhat introverted, Guilford surprised people from time to time with his dry wit. After his final oral examination, one doctoral student thanked Dr. Guilford for the opportunity to have worked with him and for letting him make his own way and make his own mistakes. Dr. Guilford replied, "I didn't realize I let you make any mistakes." In university circles, famous professors are sometimes prone to spend too much time bragging about their own accomplishments while tending to avoid activities that do not contribute to their own personal aggrandizement. Although he was very proud of his many accomplishments and honors, and justly so, Guilford never bragged about them. He usually spent most of his time with others listening to them rather than telling about himself. Furthermore, he earned a solid reputation for good citizenship among his colleagues by carrying more than his share of the work in making the university run. He dealt with other faculty members as equals and never acted like a prima donna who expected special treatment because of his star status. Nor did he try to influence or control the research and teaching of younger faculty members. One colleague recalls with gratitude that when he was a struggling young faculty member Dr. Guilford did not try to control or in-

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Biographical Memoirs: Volume 62 Unitary traits of personality and factor theory. Am. J. Psychol. 48:673-80. With E. M. Lovewell. The touch spots and the intensity of the stimulus. J. Gen. Psychol. 15:149-59. The determination of item difficulty when chance success is a factor. Psychometrika 1:259-64. With G. R. Thornton. The reliability and meaning of 'erlebnistypus' scores in the Rorschach test. J. Abnorm. Soc. Psychol. 31:324-30. 1937 With R. C. Hall. The patellar reflex and personality. J. Abnorm. Soc. Psychol. 32:275-87. With H. Nelson. The pitch of tones in melodies as compared with single tones. J. Exp. Psychol. 20:309-35. The psychophysics of mental-test difficulty. Psychometrika 2:121-33. Scale values derived from the method of choices. Psychometrika 2:139-50. 1938 Some constant errors in ratings. J. Exp. Psychol. 22:43-57. Intelligence tests. Education 58:526-30. A new revised edition of the Army Alpha Examination and a weighted scoring for three primary factors. J. Appl. Psychol. 22:239-46. The computation of psychological values from judgments in absolute categories. J. Exp. Psychol. 22:32-42. 1939 General Psychology. New York: D. Van Nostrand. With R. B. Guilford. Personality factors D, R, T, and A. J. Abnorm. Soc. Psychol. 34:21-36. With R. B. Guilford. Personality factors N and GD. J. Abnorm. Soc. Psychol. 34:21-38. A study in psychodynamics. Psychometrika 4:1-23. 1940 Editor and contributor. Fields of Psychology. New York: D. Van Nostrand. There is system in color preferences. J. Opt. Soc. Am. 30:455-59. Human abilities. Psychol. Rev. 47:367-94. An Inventory of Factors STDCR. Beverly Hills, Calif.: Sheridan Supply Co.

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Biographical Memoirs: Volume 62 With E. Ewart. Reaction time during distraction as an indicator of attention value. Am. J. Psychol. 53:554-63. With W. E. Walton. Studies in Elementary Psychology. New York: D. Van Nostrand. 1941 A simple scoring weight for test items and its reliability. Psychometrika 6:367-74. A note on Dubois' method of deriving an achievement ratio for students. J. Educ. Psychol. 32:220-22. Trends in personality research. Education 61:636-42. The phi coefficient and chi square as indices of item validity. Psychometrika 6:11-19. With M. Cotzin. Judgment of difficulty of simple tasks. Am. J. Psychol. 54:38-52. The difficulty of a test and its factor composition. Psychometrika 6:67-77. A note on the discovery of a G factor by means of Thurstone's centroid method of analysis. Psychometrika 6:205-8. 1942 Fundamental Statistics in Psychology and Education. New York: McGraw-Hill. With C. D. Lovell and R. M. Williams. Completely weighted versus unweighted scoring in an achievement examination. Educ. Psychol. Meas. 2:15-21. With T. C. Lyons. On determining the reliability and significance of a tetrachoric coefficient of correlation. Psychometrika 7:243-49. 1943 The army selects and classifies an air crew. Education 63:528-33. With H. G. Martin. Personnel Inventory: Manual of Directions and Norms. Beverly Hills, Calif.: Sheridan Supply Co. With H. G. Martin. The Guilford-Martin Inventory of Factors GAMIN: Manual of Directions and Norms. Beverly Hills, Calif.: Sheridan Supply Co. 1944 With H. G. Martin. Age differences and sex differences in some introvertive and emotional traits. J. Gen. Psychol. 31:219-29.

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Biographical Memoirs: Volume 62 1946 New standards for test evaluation. Educ. Psychol. Meas. 6:427-38. 1947 The discovery of aptitude and achievement variables. Science 106:278-82. With W. S. Zimmerman. Some AAF findings concerning aptitude factors. Occupations 26:154-59. Editor and contributor. Printed Classification Tests. Army Air Forces Aviation Psychology Research Program Reports, No. 5. Washington, D.C.: U.S. Government Printing Office. 1948 Some lessons from aviation psychology. Am. Psychol. 3:3-11. With W. S. Zimmerman. The Guilford-Zimmerman aptitude survey. J. Appl. Psychol. 32:24-34. 1949 With W. B. Michael. Approaches to univocal factor scores. Psychometrika 13:1-22. With A. L. Comrey. Prediction of proficiency of administrative personnel from personal history data. Educ. Psychol. Meas. 8:281-96. Factor analysis in a test-development program. Psychol. Rev. 55:79-94. With W. S. Zimmerman. The Guilford-Zimmerman Temperament Survey: Manual of Instructions and Interpretations. Beverly Hills, Calif.: Sheridan Supply Co. Systems in color preferences. J. Soc. Motion Pic. Eng. 52:197-210. With J. W. Holley. A factorial approach to the analysis of variance in esthetic judgments. J Exp. Psychol. 39:208-18. With E. Shneidman and W. S. Zimmerman. The Guilford-Shneidman-Zimmerman Interest Survey. J. Consult. Psychol. 13:302-6. 1950 Editor and contributor. Fields of Psychology, 2nd ed. New York: D. Van Nostrand . Fundamental Statistics in Psychology and Education, 2nd ed. New York: McGraw-Hill. With W. B. Michael. Changes in common-factor loadings as tests are altered homogeneously in length. Psychometrika 15:237-49.

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Biographical Memoirs: Volume 62 Creativity. Am. Psychol. 5:444-54. With W. B. Michael and W. S. Zimmerman. An investigation of two hypotheses regarding the nature of the spatial-relations and visualization factors. Educ. Psychol. Meas. 10:187-213. 1950 With A. L. Comrey. Measurement in psychology. In Theoretical Foundations of Psychology, ed. H. Helson, pp. 506-56. New York: D. Van Nostrand. With W. B. Michael and W. S. Zimmerman. An investigation of the nature of the spatial-relations and visualization factors in two high-school samples. Educ. Psychol. Meas. 11:561-77. 1952 When not to factor analyze. Psychol. Bull. 49:26-37. General Psychology, 2nd ed. New York: D. Van Nostrand. With B. Fruchter and W. S. Zimmerman. Factor analysis of the Army Air Forces Sheppard Field battery of experimental aptitude tests. Psychometrika 17:45-68. With W. B. Michael and N. C. Perry. The estimation of a point biserial coefficient of correlation from a phi coefficient. Br. J. Stat. Psychol. 5:139-50. Validation of measures of interests and temperament. In Applications of Psychology, ed. L. L. Thurstone. New York: Harper. 1953 Some recent findings on thinking abilities and their implications. J. Commun. 3:49-58. With R. F. Green, P. R. Christensen, and A. L. Comrey. A factor-analytic study of reasoning abilities. Psychometrika 18:135-60. The correlation of an item with a composite of the remaining items in a test. Educ. Psychol. Meas. 13:87-93. With R. C. Wilson and P. R. Christensen. The measurement of individual differences in originality. Psychol. Bull. 50:362-70. Some recent findings on thinking abilities and their implications. Bull. Natl. Assoc. Second. Sch. Princ. 37:3-13. 1954 Psychometric Methods, 2nd ed. New York: McGraw-Hill. With P. R. Christensen and N. A. Bond. The DF Opinion Survey:

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Biographical Memoirs: Volume 62 Manual of Instructions and Intepretations. Beverly Hills, Calif.: Sheridan Supply Co. With H. F. Dingman. A new method for obtaining weighted composites of ratings. J. Appl. Psychol. 38:305-7. With A. F. Hertzka, P. R. Christensen, and R. M. Berger. A factoranalytic study of evaluative abilities. Educ. Psychol. Meas. 14:581-97. With R. C. Wilson, P. R. Christensen, and D. J. Lewis. A factoranalytic study of creative-thinking abilities. Psychometrika 19:297-311. With H. F. Dingman. A validation study of ratio-judgment methods. Am. J. Psychol. 67:395-410. Systems in the relationship of affective value to frequency and intensity of auditory stimuli. Am. J. Psychol. 67:691-95. The validation of an ''indecision" score for prediction of proficiency of foremen. J. Appl. Psychol. 38:224-26. With R. F. Green, P. R. Christensen, A. F. Hertzka, and N. W. Kettner. A factor-analytic study of Navy reasoning tests with the Air Force Aircrew Classification Battery. Educ. Psychol. Meas. 14:301-25. With P. R. Christensen, N. A. Bond, and M. A. Sutton. A factor analysis study of human interests. Psychol. Monogr. 68(4), Whole No. 375. 1955 With H. F. Dingman. A modification of the method of equal-appearing intervals. Am. J. Psychol. 68:450-54. 1956 Fundamental Statistics in Psychology and Education, 3rd ed. New York: McGraw-Hill. With W. S. Zimmerman. Fourteen dimensions of temperament. Psychol. Monogr. 70(10), Whole No. 417. With N. W. Kettner and P. R. Christensen. The nature of the general reasoning factor. Psychol. Rev. 63:169-72. The structure of intellect. Psychol. Bull. 53:267-93. With N. W. Kettner and P. R. Christensen. A factor-analytic study of the factor called general reasoning. Educ. Psychol. Meas. 16:438-53. Guilford-Zimmerman Aptitude Survey. Person. Guid. J. 35:219-23.

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Biographical Memoirs: Volume 62 1957 With P. R. Christensen and R. C. Wilson. Relations of creative responses to working time and instructions. J. Exp. Psychol. 53:82-88. Creative abilities in the arts. Psychol. Rev. 64:110-18. With W. B. Michael and W. S. Zimmerman. The description of spatial-visualization abilities. Educ. Psychol. Meas. 17:185-99. With J. W. Frick. An analysis of a form of the water jar test. Am. J. Psychol. 70:427-31. With R. M. Berger and P. R. Christensen. A factor-analytic study of planning abilities. Psychol. Monogr. 71, Whole No. 435. 1958 A system of the psychomotor abilities. Am. J. Psychol. 71:164-74. 1959 Personality. New York: McGraw-Hill. With N. W. Kettner and P. R. Christensen. A factor-analytic study across the domains of reasoning, creativity, and evaluation. Psychol. Monogr. 73(9), Whole No. 479. 1961 Factorial angles to psychology. Psychol. Rev. 68:1-20. With P. R. Christensen, J. W. Frick, and P. R. Merrifield. Factors of interest in thinking. J. Gen. Psychol. 65:39-56. With P. R. Merrifield, P. R. Christensen, and J. W. Frick. Interrelationships between certain abilities and certain traits of motivation and temperament. J. Gen. Psychol. 65:57-74. Psychological measurement a hundred and twenty-five years later. Psychometrika 26:109-27. With P. R. Merrifield, P. R. Christensen, and J. W. Frick. Some new symbolic factors of cognition and convergent production. Educ. Psychol. Meas. 21:515-41. 1962 With P. R. Christensen, G. Taffee, and R. C. Wilson. Ratings should be scrutinized. Educ. Psychol. Meas. 22:439-47. With P. R. Merrifield, P. R. Christensen, and J. W. Frick. The role of intellectual factors in problem solving. Psychol. Monogr. 76, Whole No. 529.

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Biographical Memoirs: Volume 62 1963 With P. R. Christensen. An experimental study of verbal fluency factors. Br. J. Stat. Psychol. 16:1-26. Preparation of item scores for the correlation between persons in a Q factor analysis. Educ. Psychol. Meas. 23:13-22. With W. S. Zimmerman. Some variable-sampling problems in the rotation of axes in factor analysis. Psychol. Bull. 60:289-391. 1964 Zero correlations among tests of intellectual abilities. Psychol. Bull. 61:401-4. With J. W. Holley. A note on the G index of agreement. Educ. Psychol. Meas. 24:749-53. 1965 Fundamental Statistics in Psychology and Education, 4th ed. New York: McGraw-Hill. The minimal phi coefficient and the maximal phi. Educ. Psychol. Meas. 25:3-8. With R. Hoepfner and H. Petersen. Predicting achievement in ninth-grade mathematics from measures of intellectual-aptitude factors. Educ. Psychol. Meas. 25:659-82. 1966 Editor and contributor. Fields of Psychology, 3rd ed. Princeton, N.J.: D. Van Nostrand. With R. Hoepfner and K. Nihira. Intellectual abilities of symbolic and semantic judgment. Psychol. Monogr. 80(16), Whole No. 624. Intelligence: 1965 model. Am. Psychol. 21:20-26. With R. Hoepfner. Sixteen divergent-production abilities at the ninth-grade level. Multivar. Behav. Res. 1:43-66. With A. Fulgosi. Fluctuations of ambiguous figures and intellectual flexibility. Am. J. Psychol. 79:602-7. 1967 The Nature of Human Intelligence. New York: McGraw-Hill. 1968 Intelligence, Creativity, and Their Educational Implications. San Diego: Knapp.

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Biographical Memoirs: Volume 62 Creativity, yesterday, today, and tomorrow. J. Creat. Behav. 1:3-14. In History of Psychology in Autobiography, vol. 5, eds. E. G. Boring and G. Lindzey, pp. 169-91. New York: Appleton-Century-Crofts. Intelligence has three facets. Science 160:615-20. With R. Hoepfner and J. L. Dunham. Simplex components. Multivar. Behav. Res. 3:161-72. With J. L. Dunham and R. Hoepfner. Multivariate approaches to discovering the intellectual components of concept learning. Psycho L Rev. 75:201-21. With S. W. Brown and R. Hoepfner. Six semantic-memory abilities. Educ. Psychol. Meas. 28:691-717. With A. Fulgosi. Short-term incubation in divergent production. Am. J. Psychol. 81:241-46. 1969 With R. Hoefpner. Comparisons of varimax rotations with rotations to theoretical targets. Educ. Psychol. Meas. 29:3-22. With J. L. Dunham and R. Hoepfner. Cognition, production, and memory of class concepts. Educ. Psychol. Meas. 29:615-38. 1970 With R. Hoepfner and P. A. Bradley. Information-transformation abilities. Educ. Psychol. Meas. 30:785-802. With R. Hoepfner and P. A. Bradley. Transformation of information in learning. J. Educ. Psychol. 61:316-23. Creativity: Retrospect and prospect. J. Creat. Behav. 83:119-34. With A. Fulgosi and R. Hoepfner. A multivariate analysis of some controlled-association tasks. J. Gen. Psychol. 83:119-34. 1971 With R. Hoepfner. The Analysis of Intelligence. New York: McGraw-Hill. Some misconceptions regarding measurement of creative talents. J. Great. Behav. 5:77-86. Varieties of memory and their implications. J. Gen. Psychol. 85:207-28. 1972 Thurstone's primary mental abilities and structure-of-intellect abilities. Psychol. Bull. 77:129-43. Executive functions and a model of behavior. J. Gen. Psychol. 86:279-87. Some misconceptions of factors. Psychol. Bull. 77:392-96.

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Biographical Memoirs: Volume 62 With A. Fulgosi. Factor structures with divergent- and convergent-production abilities in groups of American and Yugoslavian adolescents . J. Gen. Psychol. 87:169-80. 1973 With B. Fruchter. Fundamental Statistics in Psychology and Education, 5th ed. New York: McGraw-Hill. 1974 Rotation problems in factor analysis. Psychol. Bull. 81:498-501. A psychology with act, content, and form. J. Gen. Psychol. 90:88-100. With P. R. Christensen. The one-way relation between creative potential and IQ. J. Creat. Behav. 7:247-62. With R. E. Pandey. Abilities for divergent production of symbolic and semantic systems. J. Gen. Psychol. 91:209-20. 1975 Factors and factors of personality. Psychol. Bull. 82:802-14. With M. O'Sullivan. Six factors of behavioral cognition: Understanding other people. J. Educ. Meas. 12:255-71. 1976 With J. S. Guilford and W. S. Zimmerman. The Guilford-Zimmerman Temperament Survey Handbook. San Diego: EdITS. Aptitude for creative thinking: One or many? J. Creat. Behav. 10:165-69. 1977 Way Beyond the IQ: Guide to Improving Intelligence and Creativity. Buffalo, New York: Creative Education Foundation. Will the real factor of extraversion-introversion please stand up: A reply to Eysenck. Psychol. Bull. 84:412-18. The invariance problem in factor analysis. Educ. Psychol. Meas. 37:11-19. 1978 With B. Fruchter. Fundamental Statistics in Psychology and Education, 6th ed. New York: McGraw-Hill. 1979 Some incubated thoughts on incubation. J. Creat. Behav. 13:1-8. Cognitive Psychology with a Frame of Reference. San Diego, Calif.: EdITS.

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Biographical Memoirs: Volume 62 1980 Fluid and crystallized intelligence: Two fanciful concepts. Psychol. Bull. 88:406-12. 1981 Components versus factors. The Behavioral and Brain Sciences, vol. 3, pp. 591-92. Higher-order Structure-of-Intellect abilities. Multivar. Behav. Res. 16:151-54. 1982 Cognitive psychology's ambiguities: Some suggested remedies. Psychol. Rev. 89:48-59. Is some creative thinking irrational? J. Creat. Behav. 16:151-54. 1984 Varieties of divergent-production abilities. J. Creat. Behav. 18:1-10. 1985 A sixty-year perspective on psychological measurement. Appl. Psychol. Meas. 4:341-49. 1986 Creative Talents: Their Nature, Uses and Development. Buffalo, N.Y.: Barely Limited. 1988 Some changes in the Structure-of-Intellect model. Educ. Psychol. Meas. 48:1-4.

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