This research aimed to examine positive behavioral support by teacher had been trained to reduce off-task behavior students. The participants of students was second grade of senior high school at Banjarmasin. The reason for using this design was to identifiying behavior target repeatedly with a certain time period. The instruments was be used to take data from observation form positive behavioral support and off-task behavior. The result ofanalysis data was by using visual analysis and

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... ve analysis. From two of analysis indicated that there was different between before and after positive behavioral support implemented by teacher and off-task behavior of two students were reduced into lower frequency.