We study the problem of optimally controlling a multiserver queueing system. Customers arrive in a Poisson fashion and join a single queue, served by N servers, S <Subscript>1</Subscript>,S <Subscript>2</Subscript>,… , S <Subscript>N</Subscript>. The servers have different rates. The service times at each server are independent and exponentially distributed....</subscript></subscript></subscript>

Motivated by the waiting lines between the U.S.-Canadian border crossings, we investigate a security-check system with both security and customer service goals. In such a system, every customer has to be inspected by the first-stage inspector, but only a proportion of customers need to go...