Half of All Results Change in Five Weeks
In short: take the world's most popular personality test today, take it again five weeks later, and there is roughly a one-in-two chance it hands you a different personality. The MBTI was created by a mother and daughter with no training in psychology, grew into an industry worth billions, and is still graded coldly by scientists — yet in South Korea it became something bigger than a test: a way of introducing yourself. A test that began with a son-in-law nobody could understand Katharine Briggs, an early twentieth-century American homemaker who loved reading biographies, kept asking why different people choose such different lives. She turned her home into what she called a baby training laboratory, raising her daughter Isabel as an observation project. Then Isabel married Clarence "Chief" Myers — a man unlike anyone in the family. Most mothers-in-law would have shrugged. Katharine made that difference her life's research. Years later, asked why she created the t...