Types for Proofs and Programs : International Workshop TYPES 2000 Durham UK December 8–12 2000 Selected Papers This book constitutes the thoroughly refereed post proceedings of the International Workshop of the TYPES Working Group TYPES 2000 held in Durham UK in December 2000. The 15 revised full papers presented were carefully reviewed and selected during two rounds of refereeing and revision. All current issues on type theory and type systems and their applications to programming systems design and proof theory are addressed