But one pull does not always dominate; two may have to exist in balance. Symphony orchestras engage highly trained specialists who perfect their skills, as do the operator in professional bureaucracy. But their efforts must be tightly coordinated, hence the reliance on the direct supervision of a leader- a conductor-as in simple structure. Thus a hybrid of the two configurations emerges that is eminently sensible for the symphony orchestra even if it does generate a good deal of conflict be tween leader and operators.