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Since 1991, an increasing number of Dutch secondary schools have been offering a bilingual programme (Dutch-English) in the first four years of pre-university education. In 1995 a longitudinal evaluation study of this type of education was started. In this paper the first results of a part of this study are presented. The data concern the testing of the size of passive word knowledge, measured during two consecutive school years by means of a yes/no-test. The test results of the experimental groups are compared with scores of control groups. The results indicate that the experimental groups have a larger passive vocabulary but no differences can be found between experimental and control groups in the growth of the passive vocabular