ABSTRACT Salbiana Yus. Influence Learning Approach and Mastery of Diction toward Writing Skills (An Experiment in Jakarta 35 Senior High School Students). Thesis. Graduate Program. Universitas Muhammadiyah Prof. DR. HAMKA, 2011. This thesis aims to investigate the effect of learning approach and mastery of diction in student?s writing skills. In particular, this study aims to obtain data about:…