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Using Vocabulary Self-Collection Strategy (VSS) to Improve Mastery Student’s Vocabulary

The research aims to know that Vocabulary Self-collection Strategy (VSS) can improve students’ vocabulary mastery and to find out how far Vocabulary SelfCollection Strategy (VSS) can be useful for the students' vocabulary mastery at the second-grade students of SMP Sinar Husni Medan. The methodology of this research used Classroom Action Research. It was conducted on a two-cycle. In analyzing the data, the researcher used quantitative data. The implementation of Vocabulary Selfcollection Strategy (VSS) in teaching vocabulary at eight grade students was successful. It can be seen from the progress of the mean score in cycle I to cycle II. Mean score in a period I 71.20 % and rating in cycle II 78.80 %. The implementation Vocabulary Self-collection Strategy (VSS) as a learning strategy was not only increasing students' mean score but also increase students' motivation and behavior. The students were more interested, happy, and active in teaching-learning English, especially vocabulary. Based on the result above, it could be concluded that Vocabulary Self Collection Strategy (VSS) improved their students’ vocabulary mastery.