Halfway to My Request Is Not Halfway to My Heart: Underestimating Appreciation for Partial Help.

When being asked for help, people sometimes can only offer part of what is requested (i.e., ). The present research investigates whether helpers can accurately forecast how much help-seekers appreciate this understudied form of assistance. From multiple helping scenarios and a face-to-face interaction, we demonstrate an asymmetry in helpers' and help-seeker's appraisals of partial help: Helpers anticipated less appreciation for partial help than help-seekers felt in receiving it. This asymmetry arose from helpers' greater valuation of helping outcomes over intentions to be helpful than help-seekers'. Accordingly, when helpers' intentions were discounted, this asymmetry no longer persisted. Another account-helpers feel worse for breaking norms of helping than help-seekers-was not supported. We discuss several directions for future research on the psychology of partial prosocial behaviors.