The validity of Holland's theory in the Croatian sample has been tested. The Croatian version of Holland's Self-Directed Search was applied on 1,866 Croatian adolescents from different age samples. The instrument has shown a good reliability of all RIASEC scales in all subsamples. Construct validity was also verified: The presence of circular structure of RIASEC types and two underlying dimensions was mostly confirmed, and hypothesized relations between RIASEC types and value orientations were found. Concurrent validity shows that on the basis of Holland's RIASEC scores one can predict the educational program in which the student is enrolled. The results support the validity of Holland's theory in the Croatian sample. (Contains 2 notes, 5 tables, and 1 figure.)