I cannot reveal the source or the company but a major household-name automotive company would have several teams working on projects, with one pre-selected as the "real" one and the others not told their work would be discarded. The idea being that this way you can multiply the size of each engineering team and starve the competition of competent engineers. The fact this system exists was not disclosed to the engineers in order to prevent them from quitting. I know this from an engineer who quit after accidentally meeting a member of another team within the company working on the exact same project.
It sounds like a more realistic motivation for that would be to reduce the risk of failure- if the primary team flubbed the project, the secondary team would still be an option. (Such a system would also give you an opportunity to judge how effective either team was.)
Awful thing to do to engineers, but you can understand why management would do it and why they wouldn't want to demoralize the secondary team by telling them.
No, the work of all teams except the pre-selected real one was discarded and never passed on for evaluation. If you wanted to do it for real you would do it up front and ask them all to try different approaches and have rendevous points to compare and evaluate and exchange findings. I suspect that would be much better morale for all teams involved, but would require management to give up on their "chosen" team, and put some real effort into this, which they were not willing to do (and before you ask, yes, the "backup" team suggested this and got rejected, and then got the fuck out)
