DR. JAMES R. ARMSTRONG and DR. F. GAIL GRAY are Professors of Electrical and Computer Engineering at Virginia Tech. Dr. Armstrong teaches graduate and undergraduate courses in computer architecture, HDLs, and logic design. He was a member of the original IEEE standardization committee; authored Chip Level Modeling With VHDL, and co-authored Structured Logic Design With VHDL, both from Prentice Hall. Dr. Gray teaches graduate and undergraduate courses in computer engineering, logic design, hardware description languages, coding theory, fault tolerant computing, testing, and microprocessor system design. His work has been published by IEEE Transactions on Computers; Journal of VLSI Signal Processing for Signal, Image, and Video Technology; Design Automation Conference; the VHDL International Users Forum; and many other leading journals and conferences.