There have been a great number of different research efforts into the area of analog and mixed signal BIST. And most efforts appear to be very insular -they are the efforts of a single entity. Seldom does another research entity follow up on the research of another. That's because there is little credit involved in proving someone else is right. And for competitive reasons, and because of patent protection, this extends to commercial BIST providers also. Analog and mixed-signal BIST is alive, well, and here now. It works and it saves time and money.