Standard Operator speed/ acceleration/ decelleration

I was wondering what people are using for their operator parameters? I am using

max speed = 1.5
acceration = 1.5
deceleration = 1.5

which is a quick guess from one of my colleagues who works a lot with operations/ time studies but it would be nice to have a bit of science behind my numbers. Ideally could anyone recommend some literature that addresses this?

Thanks
Paul