Many libraries are interested in changing the model they use for providing reference service from a just-in-case to a just-in-time model. However, often there is no good set of indicators in place that would help drive the decision making process. In this paper, the author will describe the evidence-based techniques and practices used at the Purdue University Calumet library to transform reference services from a traditional “sitting at the desk” model to a just-in-time, consultative approach. By using relatively simple data collection and analysis techniques, the staff in the library were able to develop a new approach to offering reference services that provides greater availability of librarians to students and faculty without an increase in staffing. Perhaps most significantly, the evidence-based techniques used by the staff should be able to be easily applied to other environments without overburdening librarians with data collection activities or complex analyses.