By Craig Callahan, founder and president of Icon Advisers in Denver, and C. Thomas Howard, professor of finance at the Daniels College of Business, also in Denver:

“Style Boxes: Outside the Box” (September 2005)

“Boxes Are Not Classes”(January 2006)

“Risky Business”(February 2006)

By John John Rekenthaler, VP of research and new products at Morningstar:

“In Defense of Style Boxes” (June 2006)