When walking to your stand?

Scent? If you are determined to hunt a particular stand even if the wind is not favorable for getting there undetected.

Sound?

They see you?

They see your light (early morning hunts)?

I've also wondered how many deer I've run off that I didn't see or hear. There is no way to know with certainly the answers to any of these, but what have you started doing differently to improve your hunting?