This volume contains 11 papers presented at the 2009 Mind/Context Divide Workshop, which was held at the University of Iowa from April 30 to May 2, 2009. The papers focus on the acquisition of properties at the interfaces. You can see the complete table of contents at http://www.lingref.com/cpp/mcd/2009/index.html. Proceedings from Cascadilla Proceedings Project are published in library binding and on the web. We offer free web access to the complete proceedings through our web site, www.lingref.com.