The emergence of aggressiveness among students requires attention from various parties,
especially schools. The direction of this research is to develop and examine the validity of
the Junior Students Aggressive Behavior Inventory (J-SABI), to know the level of suitability
and item's difficulty level, also to know the variable maps of the person's ability to answer an
item's ability to describe aggressive behavior. The sample of this study consist of 360 with
the number of items was 47. The analytical technique that used was Rasch model to …