A wait list is a list of clients who are awaiting the availability of a specified resource. The resources in question are usually required for the delivery of a service, such as funds or the availability of a place in a facility. Where the resource isn't available, a client can be added to wait list, either by allocating a certain position, or adding the client to the end of the list. Once added, a client's position on the wait list can be moved up or down, depending on how pressing the client's need for the resource is.