Question: Who developed the sixteen personality factor questionnaire (16 pf) ​?
Answer: Raymond B. Cattell, Maurice Tatsuoka and Herbert Eber
Raymond B. Cattell, Maurice Tatsuoka, and Herbert Eber
Raymond B. Cattell, Maurice Tatsuoka and Herbert Eber
Natural Questions answer: Raymond B. Cattell
Maurice Tatsuoka
Herbert Eber (from the Wikipedia article "16PF Questionnaire")