The graphics and animation capabilities of computers offer a new dimension in science testing. Instead of presenting verbal situations or questions with accompanying pictures, computers can present simulated actions and events that are the focus of science questions. The purpose of this project was to develop a valid and reliable computer-based test of integrated process skills that employed both graphics and animation to present and pose questions about science phenomena. A pool of items was prepared to assess variable identification, hypothesis formation, operational definition, experimental design, and interpretation of data. Field trials of the computer-based test were conducted with more than 150 students in grades 9 through college level. Students completed the test at computer terminals in about 45 minutes. The results of the field trial show the test to have good reliability. Difficulty and discrimination indices are within the limits expected for tests used to assess criterion-referenced achievement. The computer animated test represents an alternative way to present science phenomena to students for classroom assessment or in research and evaluation studies. (Author)