Online analysis of survey data files has been of significant interest to the Roper Center for a number of years. Integrating a data analysis system with existing finding aids would be of tremendous value to a wide variety of researchers. Dedicating resources to such an effort requires an evaluation of appropriate alternatives. This paper will present an evaluation of two current data analysis systems: NESSTAR and Survey Data Analysis (SDA). While not exhaustive in scope, this evaluation will focus on criteria pertaining to the Center's desire to integrate an exploratory analysis system with the iPOLL public opinion question databank. Evaluation criteria will include preparation of system files, system maintenance, ease of integration, performance issues and presentation features, among others.