Johnson, J. (2003). Conceptual problems as obstacles to theoretical progress in political science. Journal of Theoretical Politics, 15, 87–115. Published by Frank C.S. Liu, December 8th, 2015 Johnson, J. (2003). Conceptual problems as obstacles to theoretical progress in political science. Journal of Theoretical Politics, 15, 87–115.Download PDF Please enable JavaScript to view the comments powered by Disqus. comments powered by Disqus