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The Holland Codes or the Holland Occupational Themes (RIASEC [1]) refers to a taxonomy of interests [2] based on a theory of careers and vocational choice that was initially developed by American psychologist John L. Holland. [3] [4] The Holland Codes serve as a component of the interests assessment, the Strong Interest Inventory.
The test was developed in 1927 by psychologist Edward Kellog Strong Jr. to help people exiting the military find suitable jobs. [8] It was revised later by Jo-Ida Hansen and David P. Campbell. The modern version of 2004 is based on the Holland Codes typology of psychologist John L. Holland. [8]
John Lewis Holland [1] (October 21, 1919 – November 27, 2008) was an American psychologist and Professor Emeritus of Sociology at Johns Hopkins University. [2] He was the creator of the career development model, Holland Occupational Themes, commonly known as the Holland Codes.
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In addition to the observers, three Whitehead torpedoes were aboard. The test did electric runs (125V-175A), gas-powered runs, submerged runs, torpedo firings and torpedo reloading (Holland had one torpedo tube). Buoy with flags was added to the Holland so Frederick Rodgers and others could track the Holland during the submerged runs. The US ...
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After several tests, on 6 June Holland conducted his first proper trial. The boat ran on the surface at approximately 3.5 knots, then submerged to a depth of 12 feet, before eventually surfacing. However, problems with the engine, meant that Holland eventually connected the engine, by a flexible hose, to a steam engine in an accompanying launch ...