Horumarku wuxuu ahaa mid gaabis ah dhowrkii sano ee ku xigay markii ururada kala duwan ee cilmi nafsiga ah ee aan isku xirnayn ay isu yimaadeen ururka American Association of Applied Psychology sanadkii 1930, kaas oo u shaqeyn lahaa sidii madal koowaad ee cilmi nafsiga ilaa ka dib dagaalkii labaad ee adduunka markii APA dib loo habeeyay.
Sanadkii 1927