Tesis ini membahas efek pengajaran kosakata bahasa Inggris teks prosedur dengan menggunakan metode Contextual Teaching and Learning (CTL). Sebagai pembanding, digunakan juga kelas kontrol di dalam penelitian ini. Ancangan penelitian ini adalah kuantiatif dengan jenis Post-Test Only. Data penelitian diambil dengan menggunakan Post-Test yang diberikan sehari dan tiga minggu setelah perlakuan kepada kedua kelas partisipan. Analisis hasil penelitian dilakukan dengan menggunakan rerata dan uji t dependen dan independen menggunakan SPSS 22. Analisis tersebut menunjukkan peningkatan hasil yang signifikan pada kelas XI IPS 1 yang menerapkan metode CTL. Selain itu, hasil temuan penelitian dari wawancara dan kuesioner menunjukkan bahwa metode Contextual Teaching and Learning (CTL) memberikan pengaruh positif dalam pembelajaran kosakata di kelas, yaitu meningkatnya partisipasi pemelajar, kemampuan kosakata reseptif dan produktif, dan kolaborasi di antara pemelajar.

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This study aimed at investigating the effect of vocabulary teaching in procedure texts using Contextual Teaching and Learning (CTL) and traditional method at XI IPS 1 and XI IPS 2 at SMA Negeri 33 Jakarta. The research was carried out in the English classes at Social Sciences Class, which received the treatment of teaching vocabulary using Contextual Teaching and Learning (CTL). Another class used taditional method in teaching vocabulary. The study used the quantitative data collected through the Post-testafter the treatment, questionnaires, and interviews. The data collected from the Post-testwere analyzed by implementing a t-test using SPSS 22 and counting average scores of both groups.

The findings of the study indicate that teaching vocabulary using Contextual Teaching and Learning (CTL) method brings significant results. Furthermore, the results gathered from interviews and questionnaires confirmed that learners had a positive attitude towards CTL, as this method provided the students with a lot activities which created a learning environment that was fun, enjoyable, and effective for improving the students‟ vocabulary. Moreover, CTL also increased learners‟ participations, scores, and collaborations.