Here is the entire RAND report for CTL <a href="http://www.rand.org/pubs/monographs/2008/RAND_MG754.pdf" target="_blank">http://www.rand.org/pubs/monographs/2008/RAND_MG754.pdf</a> and here is the summary <a href="http://www.rand.org/pubs/monographs/2008/RAND_MG754.sum.pdf" target="_blank">http://www.rand.org/pubs/monographs/2008/RAND_MG754.sum.pdf</a> or you can go to this webaddress also.... <a href="http://www.rand.org/pubs/monographs/MG754/" target="_blank">http://www.rand.org/pubs/monographs/MG754/</a> ALL or most of this is quite pertinent for us