A system using one or more robots to assist a human in order fulfillment includes: a server configured to receive an order comprising an order item; inventory storage operationally connected to the server, the inventory storage comprising inventory items; an order robot operationally connected to the server, the order robot configured to assist a human to pick an order item from the inventory items; and a human-operated device operably connected to one or more of the server, the inventory storage, and the order robot, the human-operated device configured to assist the human to pick the order item.