Capabilities, one of the seven key drivers of team effectiveness, refers to fairly stable competencies and predispositions that have been shown to consistently contribute to or detract from team effectiveness. While high capability levels don’t ensure success, and adding a “star” won’t always boost performance, a significant lack of capability will hurt team effectiveness. You can’t “team” away a large capability gap. This chapter highlights 11 transportable team capabilities that are beneficial in almost any team including communicating, giving and receiving feedback, dealing with conflict, interpersonal skill, and teamwork savvy. These competencies can be developed over time. Several personal traits are usually related to team effectiveness, including collective orientation, adaptability, conscientiousness, and agreeableness. Three toxic traits, referred to as the dark triad—Machiavellianism, narcissism, and psychopathy—adversely affect teamwork. Traits are quite difficult to change, so it is worth the effort to choose the right people to join your team.