For instance, one might “trust” that a given teammate will produce high-quality work because he has always done so in the past. As desirable as this may be, it is not enough to represent the kind of trust that is characteristic of a great team. It requires team members to make themselves vulnerable to one another, and be confident that their respective vulnerabilities will not be used against them. The vulnerabilities I'm referring to include weaknesses, skill deficiencies, interpersonal shortcomings, mistakes, and requests for help.