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Sources of stress
For Example: Role conflict and ambiguity was a source of stress that these men dealt with as they struggled at finding their roles and responsibilities. This is illustrated in the scene where after all his attempt at voting guilty. The gentleman with the baseball card decided that he was going to change his vote to not guilty. And the Mexican gentleman with the mustache responded to the guy that he should only vote not guilty if he truly believes that the defendant is not guilty and not because he had enough.
Time was another form of stress that was exhibited in the movie. An example of this is when the guy with the baseball card tells the foreman to get the show going (especially because he had a baseball game to go to).

Influences on team effectiveness
For example: Member roles (self...