Another study comparing reciprocal concessions with social responsibility found neither explanation to be sufficient. This study employed confederates who asked for donations door-to-door. Participants were either given a large, moderate, or small request initially. The large request involved 10 hours of volunteering for several weeks, the moderate request involved a $30.00 donation, and the small request involved a donation of any amount. The confederate gave the smaller request after an initial large or moderate one. Participants then filled out a questionnaire that asked about the respondent's perceived obligation to comply, perceptions of negotiation and/or helping in the situation, and whether the respondent was friends with the confederate. Results show that participants were more likely to comply for friends than strangers, the DITF technique had greater compliance overall than a small request alone, and the DITF technique had larger increases in compliance for strangers. Findings regarding social responsibility and reciprocal concessions were inconclusive, with high correlations between perceptions of negotiation and guilt as well as guilt and obligation. The researchers suggest that both of the explanations work together in the DITF effect.