ABSTRACT Puji Mulyono, Iman. 2012. “The Effect of Frequency Using Computer towards Vocabulary Mastery of Students’ 1st Grade SMP NU 02 Dukuhturi Tegal Academic Year 2011/2012. A Thesis. English Department of Teacher Training and Education Faculty. Pancasakti University Tegal. Keywords: Frequency Using Computer, Vocabulary Mastery The background of this research is want to know…