By Patricia Sellers
September 10, 2009

Who’s more powerful–Oprah Winfrey or Yahoo

CEO Carol Bartz? Disney

media boss Anne Sweeney or MTV Networks chief

Judy McGrath? Who from Google

made the 2009 Fortune Most Powerful Women list?

The new rankings are out. PepsiCo

CEO Indra Nooyi is No. 1 for the fourth year in a row.

And yes, there is a science to deciding these rankings. Here I talk with CNNMoney anchor Poppy Harlow about how we do it:

[cnnmoney-video vid=/video/fortune/2009/09/09/f_mpw_list_overview.fortune]

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