Development of personality types inventory and determination of majors by personality codes

The aim of this study is to develop inventory (IPT-Inventory of Personality Types) based on Jung's Theory of Psychological Types and Briggs and Myers' contributions to this theory to be used in conducting career counseling with high school students. The inventory was developed based on rational-theoretical approach. In addition, majors by personality codes were determined. The draft form of IPT was administered to 683 volunteers attending high schools during the 2017-2018 education year in Ankara. The major by personality codes were determined according to 145 academicians at Hacettepe University during the same years. The exploratory structural equation model and exploratory factor analysis were performed in the context of the construct validity. In order to examine the concurrent validity of IPT, it was administered with MBTI Form G Turkish Version to the volunteers, and Pearson correlation calculated between the scores of these two-inventories. The reliability of the measurements was investigated by KR-20 and test-retest techniques. The data were analyzed by using Mplus 8 and Statistica 13 package programs. The results show that IPT consists of four factors-they are theoretically the same- which account for 70.93% of the total variance. The internal consistency coefficients of the IPT was calculated ranging between .90 and .94. As a result of administering IPT to the same group at two-week intervals, the Pearson correlation coefficient was calculated as ranging between .81 and .87, the Pearson correlation coefficients was also calculated as ranging between .70 to .79 between IPT and MBTI G-Turkish Version.