Preface.- 1 Introduction.- 2 Preliminaries.- 3 Quantum Spin Systems and Their Operator Algebras.- 4 The Poisson Algebra of the Classical Spin System.- 5 Intermission.- 6 Symbol Correspondences for a Spin-j System.- 7 Multiplications of Symbols on the 2-Sphere.- 8 Beginning Asymptotic Analysis of Twisted Products.- 9 Conclusion.- Appendix.- Bibliography.- Index.