This is presently the best available source on design andoptimization of particle factories using e e – circularaccelerators at the same time givingthe physical backgroundfor their construction. It addresses scientists and graduatestudents which is clearly reflected in its pedagogicalstyle. The book aims at summarizing all the currentlyavailable knowledge on the motivation to construct particlefactories, the design considerations of each of thedifferent machine options including their lattices andinteraction regions, practical details of the major systemsconstituting the machines, as well as a wide view ofpossible factories worldwide. It is the most up-to-date andunique collection of information of particle factoriespresently available.