since its release in 1949, the 16pf questionnaire has been revised four times: once in 1956, once in 1962, once in 1968, and the current version was developed in 1993. the us version of the test was also re-standardized in 2002, along with the development of forms for children and teenagers; versions for the uk, ireland, france and the netherlands were re-standardised in 2011. additionally, there is a shortened form available primarily for employee selection and the questionnaire has been adapted into more than 35 languages. the questionnaire has also been validated in a range of international cultures over time.