What common mistakes do your sales people make when talking to customers or doing system design? What things are often oversold or overpromised?
For example, I had one salesperson in my past who regularly promised end users that we could run 32 cameras on the servers we supplied, ignoring that bandwidth was different in different systems. Another bought into the hype of high (8/11 MP) megapixel cameras for a large school parking lot, even though there was no lighting and the district wanted to see fluid motion.
We are working on quizzes to test people on this.