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The Myers–Briggs Type Indicator (MBTI) is a pseudoscientific self-report questionnaire that claims to indicate differing "psychological types" (often commonly called "personality types"). The test assigns a binary value to each of four categories: introversion or extraversion, sensing or intuition, thinking or feeling, and judging or perceiving. One letter from each category is taken to produce a four-letter test result representing one of sixteen possible types, such as "INFP" or "ESTJ". The test relies on the Barnum effect, flattery, and confirmation bias, leading participants to personally identify with descriptions that are somewhat desirable, vague, and widely applicable. As a psychometric indicator, the test exhibits significant deficiencies, including poor validity, poor reliability, measuring 'dichotomous' categories that are not actually independent, and not being comprehensive. Most of the research supporting the MBTI's validity has been produced by the Center for Applications of Psychological Type, an organization run by the Myers–Briggs Foundation, and published in the center's own journal, the Journal of Psychological Type (JPT), raising questions of independence, bias, and conflict of interest. Despite controversies over validity, the instrument demonstrates remarkable influence since its adoption by the Educational Testing Service in 1962. It's estimated that 50 million people have taken the Myers-Briggs Type Indicator, and that 10,000 businesses, 2,500 colleges and universities, and 200 government agencies in the United States use the MBTI. The MBTI was constructed by two Americans: Katharine Cook Briggs and her daughter Isabel Briggs Myers, who were inspired by the book Psychological Types by Swiss psychiatrist Carl Jung. Isabel Myers was particularly fascinated by the concept of introversion and she typed herself as an "INFP". However, she felt the book was too complex for the general public, and therefore she tried to organize the Jungian cognitive functions to make it more accessible. History Briggs began her research into personality in 1917. Upon meeting her future son-in-law, she observed marked differences between his personality and that of other family members. Briggs embarked on a project of reading biographies, and subsequently developed a typology wherein she proposed four temperaments: meditative (or thoughtful), spontaneous, executive, and social. After the publication in 1923 of an English translation of Carl Jung's book Psychological Types (first published in German as Psychologische Typen in 1921), Briggs recognized that Jung's theory resembled, but went far beyond, her own. Briggs's four types were later identified as corresponding to the IXXXs (Introverts: "meditative"), EXXPs (Extraverts & Prospectors: "spontaneous"), EXTJs (Extraverts, Thinkers & Judgers: "executive") and EXFJs (Extraverts, Feelers & Judgers: "social"). Her first publications were two articles describing Jung's theory, in The New Republic, "Meet Yourself Using the Personality Paint Box" (1926) and "Up From Barbarism" (1928). After extensively studying the work of Jung, Briggs and her daughter extended their interest in human behavior into efforts to turn the theory of psychological types to practical use. Although Myers graduated from Swarthmore College in political science in 1919, neither Myers nor Briggs were formally educated in the discipline of psychology, and both were self-taught in the field of psychometric testing. Myers therefore apprenticed herself to Edward N. Hay (1891–1958), the head personnel officer for a large Philadelphia bank. From Hay, Myers learned rudimentary test construction, scoring, validation, and statistical methods. Briggs and Myers began creating their indicator during World War II (1939–1945) in the belief that a knowledge of personality preferences would help women entering the industrial workforce for the first time to identify the sorts of war-time jobs that would be the "most comfortable and effective" for them. The Briggs Myers Type Indicator Handbook, published in 1944, was re-published as "Myers–Briggs Type Indicator" in 1956. Myers' work attracted the attention of Henry Chauncey, head of the Educational Testing Service, a private assessment-organization. Under these auspices, the first MBTI "manual" was published, in 1962. The MBTI received further support from Donald W. MacKinnon, head of the Institute of Personality and Social Research at the University of California, Berkeley; W. Harold Grant, a professor at Michigan State University and Auburn University; and Mary H. McCaulley of the University of Florida. The publication of the MBTI was transferred to Consulting Psychologists Press in 1975, and the Center for Applications of Psychological Type was founded as a research laboratory. After Myers' death in May 1980, Mary McCaulley updated the MBTI manual, and the second edition was published in 1985. The third edition appeared in 1998. Format and administration In 1987, an advanced scoring-system was developed for the MBTI. From this was developed the Type Differentiation Indicator (TDI), which is a scoring system for the longer MBTI, Form J, which includes the 290 items written by Myers that had survived her previous item analyses. It yields 20 subscales (five under each of the four dichotomous preference scales), plus seven additional subscales for a new "comfort-discomfort" factor (which parallels, though not perfectly measuring, the NEO-PI factor of neuroticism). This factor's scales indicate a sense of overall comfort and confidence versus discomfort and anxiety. They also load onto one of the four type-dimensions: guarded-optimistic (T/F), defiant-compliant (T/F), carefree-worried (T/F), decisive-ambivalent (J/P), intrepid-inhibited (E/I), leader-follower (E/I), and proactive-distractible (J/P). Also included is a composite of these called "strain". There are also scales for type-scale consistency and comfort-scale consistency. Reliability of 23 of the 27 TDI subscales is greater than 0.50, "an acceptable result given the brevity of the subscales". In 1989, a scoring system was developed for only the 20 subscales for the original four dichotomies. This was initially known as "Form K" or "the Expanded Analysis Report". This tool is now called the MBTI Step II. Form J or the TDI included the items (derived from Myers' and McCaulley's earlier work) necessary to score what became known as Step III. (The 1998 MBTI Manual reported that the two instruments were one and the same) Step III was developed in a joint project involving the following organizations: the Myers–Briggs Company, the publisher of all the MBTI works; the Center for Applications of Psychological Type (CAPT), which holds all of Myers' and McCaulley's original work; and the MBTI Trust headed by Katharine and Peter Myers. CAPT advertised Step III as addressing type development and the use of "perception and judgment" by respondents. Conce.... Discover the Thomas Myers James Earls popular books. Find the top 100 most popular Thomas Myers James Earls books.