[Whatever]

If you really want everyone to stay, my suggestion would be to lock the door and not let them leave. Add in some shackles and you can get 100% retention.


The reality is science/engineering is hard. And I don't mean mentally hard but hard on your ego. Most school work is based on coming to preset correct answer. Science/engineering is all about finding out what you don't know or what mistakes you made. A good science experiment in the real world is about getting to the next question. Most real world engineering is about taking the best available information to design something so you can find out what you could have done better. There are a lot of people that don't react well to that - especially if they are used to coming to the correct answer. In addition to the good advice listed already, my suggestion is to make sure that that is a known expectation coming into the program.