Remember your kindergarten report card, when you were evaluated on things like your ability to follow directions, name the colors, and sing the alphabet? It also included an early assessment of a skill that would influence your success for the rest of your life: the ability to "play well with others." The criteria were pretty basic at the time: share, wait your turn, don't hit or yell, help when someone is struggling. As you grow up, many of the same basic principles apply, but situations can be much more complicated for adults to play well together and still achieve desired results.
Context and personal needs often create internal conflict when trying to weigh the needs of the few against the good of the whole. And as a leader, sometimes you have to make a conscious choice to make others unhappy. Still, with a little finesse, you can meet objectives and still all play in a happy sandbox. You may not satisfy everyone all of the time, but then working together to resolve conflicts, rather than just being pleasant all of the time, can make a team stronger.
Via Vicki Kossoff @ The Learning Factor, Ricard Lloria