Introduction

Although progress has been made on semantic Webs during the past decade, much progress has also been made on trustworthy information systems over the past three to four decades. Such systems include secure systems, high-assurance systems, and high-integrity systems. Until recently much of the focus has been on security (i.e., confidentiality). However, recently there has been work on integrating features such as security, integrity, trust management, fault tolerance, and real-time processing.