The following link provides an excellent article authored by Stephen C. Meyer on the reasoning behind the Intelligence Design position. Stephen C. Meyer is director and Senior Fellow of the Center for Science and Culture at the Discovery Institute, in Seattle.
Meyer earned his Ph.D. in the History and Philosophy of Science from Cambridge University for a dissertation on the history of origin of life biology and the methodology of the historical sciences. Previously he worked as a geophysicist with the Atlantic Richfield Company after earning his undergraduate degrees in Physics and Geology.