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kkoelz
The 1950's. Can be found in an article in the "journal of applied psychology" from 1958 and another article in 1959.
baezalice565

Hello!

The Holland Code was developed by Psychologist John Holland over his career, starting in 1950 until 1980. The Holland Code is one of the most popular career tests, acording to this test there are a set of six personality types (realistic, investigative, artisitc, social, enterprising and conventional) and people fit into them.

Hope this helps.

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