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Divvying up chief executive responsibilities has had mixed results

THE GOOD
Company: California Pizza Kitchen
CEOs: Rick Rosenfield and Larry Flax
Skinny: Together they founded the high-end pizza chain in 1985 and still run it today.

THE BAD
Company: Kraft Foods
CEOs: Betsy Holden and Roger Deromedi
Skinny: They shared the top job from 2001 to 2003. Then Holden was demoted amid sagging sales and left.

THE UGLY
Company: Citigroup
CEOs: Sandy Weill and John Reed
Skinny: They had a tense relationship after the 1998 merger of Citicorp and Travelers. In 2000, Reed left.