The aim of the research was to examine the validity of the revised Inventory of Children's Activities (ICA-R) on a sample of Croatian students from different fields of study. The study involved 317 students with an average of 24 years. As a comparative measure, we used a short version of the Personal Globe Inventory questionnaire (PGI Mini), measure that was already validated on Croatian sample. The results indicated acceptable levels of reliability for both measures. The expected circular structure was more strongly confirmed by a randomization test for the PGI Mini questionnaire (CI = 0.86, p = 0.02) than for the ICA-R questionnaire (CI = 0.51, p = 0.02), while factor analysis indicated that in the variability of both instruments there are expected general factor and two substantial dimensions. The substantial dimensions somewhat correspond to Prediger's dimensions of people-things and data-ideas. Furthermore, correlation of correspondent RIASEC types measured by ICA-R and PGI Mini instruments was confirmed. The expected gender differences in the RIASEC interests of both instruments were also confirmed: girls achieved higher results on the Artistic and Social scales, while boys achieved higher results on the Realistic type scale. The results indicate that the PGI Mini questionnaire is more appropriate for the student sample than the ICA-R questionnaire, and future research should focus on validation of the ICA instrument directly on a sample of primary and secondary school students.