This version is the final, as submitted version and will differ from the published version.

I am honored to be elected President of the

Methods for differential psychologists are the methods of all scientists: describe and test models of data. Our field is distinguished by the nature of our data and the specialized tools we use for analysis. For the differential psychologist, data come from self-report, from observations, from physiology, and from behavioral residues. Data are recorded over time and over space. The challenges of collecting data are limited only by our imagination. Methods of analysis emphasize model fitting and model evaluation.