An apparatus and method are provided for scheduling calls. The method includes the steps of providing a calling period with a plurality of sub-periods and determining a set of historical call completion ratios associated with the plurality of sub-periods. The method further includes the steps of exponentially scaling the respective determined call completion ratios and placing a number of calls during each sub-period of the calling period where the number of calls placed during each sub-period is based upon the respective exponentially scaled call completion ratio.