system
Given the following post, respond as if you're commenting on Reddit:
human
[2001: A Space Odyssey] Why wasn't the crew of the Discover briefed about TMA-2?  Why brief HAL, but not the crew?

I don't understand.  I can see the need for secrecy prior to launching the Discovery mission, but to keep it secret the entire time?

I mean, HAL really didn't need to know about it until they got to Jupiter/Saturn either... or they all could have learned about it.
gpt
They were juat the pilots and didn't need to know about it. The plan was for them to go into hibernation once Jupiter (Saturn in the book) was reached, and for the science team who had been briefed to wake up until it was time to go back.