The primary purpose of this study was to assess high school students’ performance on
science process skills in biology. In order to collect data, a test instrument composed of 27
restricted response questions developed by the authors was administered to 258 (129 males and
129 females) second year students at 8 high schools in Gyeongsangnam-do. The results were
as follows: The students received low, unsatisfactory mean scores in the test of science process
skills in biology, and individual differences were very large. Out of the seven categories, the
achievement score was the highest, and as for the interpretation of the results, formulation of
problems or hypotheses, performance, application of results, and identification of variables or
control of experiment followed in order. Finally, the lowest achievement score was in the
category of design of ways and means. Students who had experienced experimental activities
in the subject matter of biology scored significantly (p<0.01) higher than those with less
experience. Gender difference in the mean scores of science process skills in biology was not
found. Finally, there was a statistically significant (p<0.01) and a fairly strong correlation
(r=0.599) between the students\' score in the science process skills test and learning achievement
in biology.