Changing what science is and how it's done

Having multiple overlapping theories of a knowledge domain is better than having just one.  For more than 50 years I have been following this scientific pluralism (see my Sept. 26, 2010 blog for examples).  What follows is a Bayesian argument for scientific pluralism following Cheeseman (in The Mathematics of Generalization, D. H. Wolpert, ed., 1995 and references therein).  Conventional science can be seen to be an approximation to scientific pluralism.