Isabelle HOL : A Proof Assistant for Higher Order Logic This textbook like tutorial is a self contained introduction to interactive proof specification and verification in higher order logic using the proof assistant Isabelle 2002. In contrast to existing Isabelle documentation this book provides a direct route into higher order logic by bypassing first order logic and minimizing discussion of meta theory. Isabelle is a generic system for implementing logical formalisms and Isabelle HOL is the specialization of Isabelle for higher order logic; this theorem prover is well suited as a specification and verification system