153 FEMALE STUDENTS PARTICIPATED IN 2 STUDIES TO INVESTIGATE THE EFFECT OF THE DESIRE TO ESTABLISH OR MAINTAIN JUSTICE IN A SOCIAL SITUATION (THE NEED TO BELIEVE IN A JUST WORLD) ON ALTRUSTIC BEHAVIOR. IN EXP. I, SS WHO HAD EXPERIENCED BETRAYAL BY 1 PARTNER APPARENTLY ATTEMPTED TO IDENTIFY WITH A MORE SUCCESSFUL PARTNER IN ANOTHER TASK. REWARDED SS, HOWEVER, MADE THE MOST EFFORT TO HELP A PREVIOUSLY BETRAYED PARTNER. IN EXP. II, WHEN THE OPPORTUNITY TO IDENTIFY WITH A MORE SUCCESSFUL PARTNER OR DISASSOCIATE FROM A PARTNER WHO HAD FAILED WAS PREVENTED, THE EXPERIMENTAL HYPOTHESES WERE SUPPORTED: SS WHO HAD BEEN BETRAYED PREVIOUSLY WORKED HARDEST FOR A PARTNER WHO HAD BEEN SIMILARLY BETRAYED, AND PARTNERS WHO HAD BEEN BETRAYED EARLIER ELICITED MOST WORK FROM ALL SS. (PsycINFO Database Record (c) 2017 APA, all rights reserved)