The movement towards managed care in the public mental health system h
as surpassed efforts to develop a systematic literature concerning its
theory, practice, and outcome. In particular little has been written
about potential challenges and difficulties in translating managed car
e systems from their origins in the private sector to the delivery of
public sector mental health services. This paper provides an overview
of managed care definitions, organizational arrangements, administrati
ve techniques, and roles and responsibilities using a theoretical fram
ework adopted from economics referred to as principal-agent theory. Co
nsistent with this theory, we assert that the primary function of the
managed care organization is to act as agent for the payor and to mana
ge the relationships between payers, providers, and consumers. From th
is perspective, managed care organizations in the public mental health
system will be forced to manage an extremely complex set of relations
hips between multiple government payers, communities, mental health pr
oviders, and consumers. In each relationship, we have identified many
challenges for managed care including the complexity of public financi
ng, the vulnerable nature of the population served, and the importance
of synchronization between managed care performance and community exp
ectations for the public mental health system. In our view, policy reg
arding the role of managed care in the public mental health system mus
t evolve from an understanding of the dynamics of government-community
-provider-consumer ''agency relationships.''