List of contributors; Acknowledgements; 1. Particle physics and fundamental theory: introduction and guide to Duality and supersymmetric Theories David Olive, and Peter West; 2. Solitons N. S. Manton; 3. Nonlinear electromagnetic self-duality and Legendre transformations Mary K. Gaillard and Bruno Zumino; 4. Supersymmetric s-models in 2 dimensions Bruno Zumino; 5. Introduction to duality David I. Olive; 6. Supersymmetric monopoles and duality Jerome P. Gauntlett; 7. Seiberg-Witten theory and S-duality Tohru Eguchi; 8. Supergravity, Brane dynamics and string duality P. C. West; 9. Supergravity vacua and solitons G. W. Gibbons; 10. An introduction to non-perturbative string theory Ashoke Sen; 11. Lectures on D-branes Constantin Bachas.