Most never accepted the validity of the concept. "Just get an adequate computer. That's management's problem." OK, another story. A friend of mine was a Physics student at Rolla (University of MO sub-campus) and also very good at programming/analysis. He had a roommate who was an ME student, and just learning programming. He saw his professor fiddling with one of those 15-tile puzzles, and said "Hey, I could write a program to solve those". His prof said it would be a good exercise, and gave him an account on the 370/168 at the main campus. He wrote it, and tried it, but it kept running out of time. He assumed an infinite loop, and eventually mentioned it to the Physics student. My friend sensed a teachable moment and said, Hmm, you have 16 nested do loops The guy whips out his trusty HP45 and starts calculating. My friend smiles, as he already knows that 16^^16 will not be computable on the calculator. So, they trudge over to the comp. Sci. building and he shows the guy the System/360 storage and timing estimates book, and they work out that JUST the loops, themselves, will take something like 10 billion years to complete. He eventually chopped out useless iterations and got a program that ran in a minute or so. So, the moral is that there are relatively modest problems that can become TOTALLY un-computable with a poor algorithm. No computer ever made could have finished his poorly thought out program. Jon