VLBI Polarimetry Study of the CJF Sample Lindsey Pollack (UCB/NRAO) This summer I worked with Greg Taylor and Bob Zavala studying 5 GHz VLBI polarimetry data of 182 sources from the Caltech-Jodrell Bank Flat-spectrum survey. Because our sample ranged in morphologies and optical classifications, we grouped these flat-spectrum, extragalactic sources and did a statistical comparison of their source properties. We specifically focused on comparing such properties as fractional polarizations of cores and jets, and the correlation between jet axis angle and electric vector position angle in the cores and jets. When I arrived in Socorro the data had already been calibrated. After editing, imaging and self-calibrating in DIFMAP and imaging in AIPS, I spent a large part of the summer writing programs in IDL which would measure meaningful source properties. As more and more properties were measured, new and interesting questions about these sources became evident. I continued to write more programs while reading journal articles and comparing our data to the literature. At the end of the summer I gave a powerpoint presentation about our project. While we are still interested in as of yet unmeasured source properties such as the degree of jet bend, the current goal is to submit a paper to the Astrophysical Journal by October. Due to our insufficient number of BL Lac type objects in the sample, many of our results will be more speculative rather than concrete. However, we do have a large enough number of quasars to add support to the claims that there exists a correlation between jet axis angle and polarization angle in the jet. I plan to continue working on this study throughout the year and to present our findings at the January AAS conference.