During the Fall 2012 semester a study was conducted in a junior-level constraint-based modeling course to determine the relationship between students' ability to create solid models when given an assembly drawing and their spatial visualization ability. Students were administered the PSVT:R and the MCT and were then given an assembly drawing and asked to model as many of the seven parts as possible during a 110 minute class period. The parts in the assembly ranged in complexity from a ball to a valve body. Students were given a ruler to measure parts on the Bsize drawing and determine sizes of features based on the given scale (2:1). Relationships were examined between the PSVT:R, MCT, modeling activity, final project and the final exam. This paper will present the results of this study and discuss implications for future research.