Another factor not previosly mentioned here is the unsuing roll after a stall. If lateral control is not maintained throughout a full stall, a severe rolling action may ensue rendering a loss of control as the ailerons become ineffective. The other factor is acft configuration, with gear and flaps down, not only does stall speed change, but control and recovery carachteristics as well. When I was being trained, I was taught to listen for the "elephants on the wings", in large acft a stall warning will be encontered on an encroaching stall, followed by a banging noise as the airflow buffets against the wings. I have only ever heard one legitamate stall warning, caused by a sever tailwind shear, we recovered normally and landed uneventfully, and when I made some additional S&G calculations on the ground, I found we were still a good 10 knots above Vstall!
"Never trust a clean Crew Chief"