Researchers measured the outcome of three conditions on the charitable giving behavior of donors across two different field experiments. In the first condition, donors were solicited to increase the amount that they contributed immediately. In the second condition, donors were solicited to increase the amount of their donation in one months time. In the third condition, donors were asked to increase their donation amount in two months time. The results show that donors were more likely to increase their donation amount when they were committing to increasing their donation at a future time.