Chemistry goes a long way in the playoffs

Editor's note: Jim O'Brien went to the playoffs three times as a head coach in the NBA. This year he is taking ESPN.com Insider to the postseason with his daily updates and analysis.

Previous entries:
• April 25: Playoff preparation
• April 26: Playoff psychology
• April 27: LeBron's learning

In my jobs in Boston and Philadelphia, early in the season I would write two words on the board. These two words and our players' ability to understand the difference between the two concepts and how they fit together were critical to our success. The words were: