The hypothesis that higher levels of job knowledge and/or more extensive career exploration would be indicated in higher correlations between self-estimates and measured interests was investigated in two separate studies. Job knowledge was assessed using the Job Knowledge Survey (JKS), and career exploration was assessed using the questionnaire, Finding Out Facts about Jobs (FOFAJ). In the first study, the JKS was administered to 77 Australian students in year 10 together with the Vocational Interest Survey, a questionnaire of vocational interests, and the Work Interest Survey, a self-rating scale of the same interests. The effect of level of consistency among interests and the relationship between vocational types and job knowledge were analyzed. Results showed that neither factor influenced job knowledge and did not support the hypothesis that job knowledge and self-estimate ability are related. In the second study, FOFAJ was administered to 101 students in year 10. The two measures used in the first study were also administered. No evidence indicated that scores on the career exploration measure were affected by students' vocational type or the consistency of their interests. Self-estimate ability was not correlated significantly with the extent of career exploration. However, differentiation among the measured interests was related to career exploration. (YLB)