Businessweek published its bi-annual ranking of the best MBA programs, and surprisingly Duke took the top spot among U.S. programs. Wharton took second and Chicago took third.

A few changes were implemented in the ranking’s methodology this year, creating a few surprises – Yale in the sixth spot and Michigan in ninth, while Harvard was only ranked eighth, MIT only at 14, and Berkeley only at 19.

This year’s Businessweek ranking included 112 schools (the largest number since the ranking began in 1988), 85 U.S. and 27 international, and was based on a survey of students’ satisfaction (weighted 45% in the final calculation), a survey of employers (45%), and quality of faculty (10%).

The top 20 U.S. programs:
1    Duke (Fuqua)
2    Pennsylvania (Wharton)
3    Chicago (Booth)
4    Stanford 
5    Columbia
6    Yale
7    Northwestern (Kellogg)
8    Harvard 
9    Michigan (Ross)
10    Carnegie Mellon (Tepper)
11    UCLA (Anderson)
12    North Carolina (Kenan-Flagler)
13    Cornell (Johnson)
14    MIT (Sloan)
15    Dartmouth (Tuck)
16    Indiana (Kelley)
17    Maryland (Smith)
18    Emory (Goizueta)
19    UC Berkeley (Haas)
20    Virginia (Darden)

And the top 10 non-U.S. schools:
1    Western (Ivey)
2    IE Business School
3    ESMT
4    London Business School
6    Cambridge (Judge)
7    Oxford (Saïd)
8    IESE 
9    IMD
10    Queen’s

Put Me in Business (applying in less than a year)
Put Me in Business (applying in more than a year)