A method for the movement of products is described. The method uses a facility that contains warehouse shelves; each shelf has a front, at least one moveable frame which travels to each shelf front to access the containers stored on each shelf. The moveable frame includes a repositionable storage ledge, a lifting device, and a gripping device, along with a ramp for a mobile robot. Mobile Robots exchange payloads between moveable frames and are moved from location to location by the moveable frames.