ERA INDRIYANI, 1606501425. "The Effect of Vocabulary Mastery toward Students Writing Ability of The First Year Students (A Case Study at SMA N 1 Pangkah in Academic Year 2009/2010)". (2010) Thesis. English Department. Faculty of Teacher Training and Education. Pancasakti University Tegal. Keywords : Vocabulary Mastery and writing ability. The objective of this research is to know whether…