This article presents the results of the development and validation process of a locus of Control instrument, in a sample (n = 1845) of training participants at public and private organizations in the Federal District. The valid responses to the developed instrument have constituted three factors, namely Internality, Externality/Chance and Externality/Others, each one of them with 12 items, with reliability scores higher than those reported in national and international studies (0.89, 0.92 and 0.80, respectively). This study also sought to investigate the sample of participants demographic profile, based on their scores in each one of the three mentioned factors. Given the created response categories, a higher number of significant differences were observed between the groups in the Internality factor. One reason for this may be that most respondents have reached high scores in this factor, because they could not correctly distinguish their judgments concerning external sources of control.
locus of control; scale validation; evaluation of training
