This study attempted to assess the extent to which the concept of vocational maturity was useful in describing the vocational behaviour of New Zealand adolescents. A sample, consisting of forty-four third and fifth form boys and fifty-two third and fifth form girls, selected from three co-educational schools and matched for level of ability and socio-economic level, answered a questionnaire designed. to assess their level of vocational maturity. Four dimensions of vocational maturity were selected for study: Information and Planning, Crystallisation of Traits, Stability of Vocational Choices and Realism of Vocational Choices. After an interval of 104 days, the identical questionnaire was readministered in order to determine the stability of the adolescent’s behaviour. The results indicated, that only 3 of the 6 indices of the dimension Information and Planning, and all 3 indices of the dimension Crystallisation of Traits, were valid measures of vocational maturity. Furthermore, no significant differences were found to exist between the sexes, on the four dimensions. From these results, several conclusions were formulated.