Categories and effective computations.- Polymorphism is set theoretic, constructively.- An equational presentation of higher order logic.- Enriched categories for local and interaction calculi.- The category of Milner processes is exact.- Relating two models of hardware.- Foundations of equational deduction: A categorical treatment of equational proofs and unification algorithms.- A typed lambda calculus with categorical type constructors.- Final algebras, cosemicomputable algebras, and degrees of unsolvability.- Good functors ... are those preserving philosophy!.- Viewing implementations as an institution.- An interval model for second order lambda calculus.- Logical aspects of denotational semantics.- Connections between partial maps categories and tripos theory.- A fixpoint construction of the p-adic domain.- A category of Galois connections.