Distributed service networks encompass various facilities with which we
have daily contact. In the public sector they include, for instance,
ambulance, fire, and police services; in the business sector they
include maintenance and repair services, road services, courier
services, and the like. Policy making problems in distributed service
networks can be clearly classified into a number of hierarchical levels.
The levels are distinguished by the time horizon of the problem, by the
amount of cost involved in the implementation of a solution, and by the
political implications of the solution. This top-down classification is
typical of what is known as the "systems approach," advocating that the
direction of the analysis of complex systems should be from the whole to
the details. The top-down classification consists of the following
categories of policies: 1. Zoning: How should a network be partitioned
into subzones? 2. Station location: Where should service stations or
service units be located? 3. Resource allocation: What amount of
resources should be allocated to the stations? vii viii Preface 4.
Dispatching, routing, and repositioning: What is the optimal dis-
patching policy, what are the optimal routes for nonbusy units, and
under what circumstances is it worthwhile to reposition a certain idle
unit? A top-down approach implies that each of the problems is solved
separately; however, the solution of a higher-level problem sets
constraints on problems at lower levels.