Which were the greatest sports teams in history? And what distinguished those teams from other celebrated but not quite so excellent teams or the even weaker ones?

Sam Walker, an editor at The Wall Street Journal, set out 11 years ago to answer those questions. He checked the normal factors we assume are responsible for team success, including having one of the great athletes of all time in its ranks, overall talent, money and resources, culture, management, and the coach. None explained the difference.

In the end, it was the team captains – and seven traits they shared -- that explained the difference between all-time greatness and the rest of the field. Although his book, The Captain Class, has a broad scope, Mr. Walker says it's about a single idea, "one that is simple, powerful, and can be applied to teams in many other fields, from business and politics to science and the arts. It's the notion that the most critical ingredient in a team that achieves and sustains historic greatness is the character of the player who leads it."

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Choosing the elite teams required considerable thought. He opted for those with five or more members, so no single individual could be too influential in performance. He looked at major sports, wanting teams whose dominance extended over many years against top competition. His search extended to the 1880s, unearthing 122 finalists, but using eight criteria he whittled that down to 16 in the top tier, including the Collingwood Magpies from 1920s Australian rules football; the New York Yankees from 1949-53; the Hungarian men's soccer team of the early 1950s; the Montreal Canadiens of the late 1950s; the San Antonio Spurs from 1997-2016; and two editions of New Zealand's famed All Black rugby squad.

The seven traits he delineated of their captains were:

This is a fascinating book for sports fans, full of insider stories on top teams and the sources of their success. But it also offers leadership insights applicable outside of sports.