A study supplementing earlier research by Lalande and Schweckendiek investigated comparisons and correlations obtained from testing a group of 17 university students of German using both the American Council on the Teaching of Foreign Languages (ACTFL) Oral Proficiency Interview (OPI) and the most recent revision of the examination for the Zertifikat Deutsch als Fremdsprache (ZDaF). The OPI is a direct test of speaking proficiency, while the ZDaF combines direct, function-oriented, oral and written tests with discrete, multiple-choice tests of reading, listening, and grammar/vocabulary skills. The most important result of the study was that the data revealed a very strong correlation between OPI and ZDaF. Evidence also indicated a strong correlation between the OPI and the composite of the oral portions of the ZDaF, and between the OPI and the composite of the written portions of the ZDaF. The results also mirrored earlier findings of a high correlation between the OPI and the ZDaF grammar/vocabulary development sections. The advantages and disadvantages of administering each test are presented so that test administrators can make the best informed choices. (DJD)