Answer:
physically lift heavy items
Explanation:
pick materials based on order of delivery (that makes sense so you know when everything comes in)
pick materials based on due date (that makes sense so you how to plan and order everything to line up right)
pick materials using a pre-programmed, efficient route (that makes sense so you have a guide! You won't have to stress this way and it's seems simple.)
physically lift heavy items (that doesn't makes sense if they're heavy you'll be wasting your time fighting up with it. Have people help do that.)
