F OR MANY YEARS THE UNITED STATES has played a leading role in both designing and implementing new science curricula and structuring and using a variety of tests to assess student achievement. Recently the use of standardized tests has been severely criticized. The major arguments advanced by the critics assert that standard-. ized tests in their present form fail to measure important outcomes and therefore present a distorted picture of student achievement. In addition, because administrators, teachers, students, parents, and employers often base their decisions on the results of standardized tests, these tests tend to dictate and shape what is being studied in the schools very narrowly rather than to reflect a curriculum that is designed to achieve a variety of important objectives. One way to overcome this problem is to abolish external examinations. Initially, this appears to be an attractive suggestion. However, a close analysis of how schools, students and teachers operate and relate to learning, as well as a careful consideration of the means available to maintain acceptable standards of achievement, should deter us from adopting this easy approach. I suggest that instead we should try to improve our testing procedures. Can we not use examinations as an integral part of our curriculum and instruction? Is it not possible to use examinations as an asset rather than as a constraint? The following example illustrates how we might implement these ideas. All students in Israel study biology for three periods each week up to the end of the ninth grade. Many continue their studies in the tenth grade. In the ninth and tenth grades, their courses are based on an adaptation of the BSCS Yellow Version. Students who elect to major in biology continue their studies with five to six periods each week in the eleventh and twelfth grades. The BSCS Second Course, analysis of research papers, projects, open-ended laboratory investigations, and extensive work in field biology constitute the curriculum for majors. What is expected of these students? Program objectives include the following: 1. Acquisition of functional knowledge based on the major themes and principles of inquiry in biology. 2. Familiarity with common plants and animals in their natural habitats. 3. Knowledge of and ability to apply the intellectual skills and processes of inquiry that characterize biology. 4. Ability to cite examples illustrating the fluid nature of biological knowledge. 5. Ability to apply knowledge, ideas, principles and skills in (a) critical analysis of an unfamiliar research paper; (b) designing and carrying out biological investigations in the laboratory, in the field, and in the library; and (c) solving problems and producing new knowledge. A comprehensive examination that reflects the major objectives and learning experiences of studying biology for four years has been designed. This examination, developed and improved over the past several years, has played a major role in the implementation of inquiryoriented learning of biology in Israeli high schools. I believe that biology educators in other countries can draw some useful conclusions from the following case study.