A method for scheduling outbound communications to sales leads based, at least partly, on a model of customer behavior derived from (i) customer data gathered from a plurality of customers that initiated contact with an electronic communications interface, and (ii) time data recording for each of the customers a time or time period at which the customer interacted with the electronic communications interface. The model predicts, for one or more time periods and segments of a population, a likelihood of successfully engaging with a person from the segment of the population. The scheduling includes prioritizing the outbound communications to the sales leads during one or more defined time periods.