John E. Jackson is M. Kent Jennings Collegiate Professor of Political Science at the University of Michigan, Ann Arbor, where he has been teaching since 1980. He is the recipient of a Guggenheim Fellowship and two J. W. Fulbright Research Fellowships and received his PhD from Harvard University. He is the author of Constituencies and Leaders in Congress: Their Effects on Senate Voting Behavior (Harvard University Press, 1974), co-author of Statistical Methods for Social Scientists (Academic Press, 1977), and editor of Institutions in American Society (University of Michigan Press, 1989). Jacek Klich is Assistant Professor at the Institute of Economics and Management, Jagiellonian University. He received a Ph.D. in Political Science from Jagiellonian University and a PhD in Economics from Krakow University of Economics. He is a recipient of the Alexander Hamilton Fellowship and the ROTARY International Scholarship. He is co-editor of Managing Health Services in Poland (Jagiellonian University Press, 2000) and Privatisation and Restructurisation in East-Central Europe (Platan, 1993). Krystyna Poznanska is Associate Professor at the Warsaw School of Economics. She received her PhDs in Economics and Habilitation from the Warsaw School of Economics. She is the author of Research and Development Sphere of Enterprises (Warsaw School of Economics, 2001) and Source of Competitive Advantage of Enterprises (Warsaw School of Economics, 2002).