SUMMARY
This research aims to investigate whether the use of project-based learning assisted by audio visual media can increase students’ activities. This research was an action research The object of this research were students in East Nusa Tenggara which are students in SMAK Suria and those in SMA Negeri 1 Atambua The data were collected through observation, interview, document ion and questionnaires technique. This research utilized qualitative and quantitative data analysis. The combination method was convergent parallel mixed methods type that is the researcher collected qualitative and quantitative data at the same time, analysed data separately, and compared the findings to know whether or not those findings complete each other. The result of this research showed that the implementation of PBL assisted by audio visual media in Economics increased learning activities in class XI Social science at SMAK Suria Atambua and class XI social science at SMA Negeri 1 Atambua The results were shown through the improvement of learning activities in which the result of pretest was 41.41% and the post test was 61.09% after getting treatment in cycle 1 and increased to 78.91%. This also happened in SMA Negeri 1 Atambua, class XI social science. After implementing PJBL assisted by audio visual media, from 42.59% it increased to 56.49 in cycle 1until 82.49% after gettingt treatment in cycle II that is included in high criteria.