  The design of optimal dynamic disturbance accommodation controller with
limited model information is considered. We adapt the family of limited model
information control design strategies, defined earlier by the authors, to
handle dynamic controllers. This family of limited model information design
strategies construct subcontrollers distributively by accessing only local
plant model information. The closed-loop performance of the dynamic controllers
that they can produce are studied using a performance metric called the
competitive ratio which is the worst case ratio of the cost a control design
strategy to the cost of the optimal control design with full model information.
