Individual difference in active perceived partner responsiveness (APR) predicting daily relationship evaluation in two conditions. Pre-tested relationship satisfaction and global partner perceived responsiveness, race, family income, and relationship type were controlled. Range of daily relationship evaluation scale: [1, 9]. Condition × APR interaction: b=.45, p<.000; simple slope: b=.44, p<.000 for Expressed Gratitude condition, b=−.01, p=.892 for Active Control condition.