AVNER ENGEL, PhD, has 45 years' experience in areas of software programming, systems and software engineering, technical management within large firms in the United States and Israel, academic teaching, and scientific research. He is the author of Verification, Validation and Testing of Engineered Systems, published by Wiley as part of Wiley's Systems Engineering and Management Series. Dr. Engel is currently with the Tel Aviv University Systems Engineering Research Institute (TAU-SERI).