Abstract: An order-picking system for order-picking articles stored in a storage rack into conveying pockets includes a storage rack areas arranged in rack rows and/or rack levels for storing the articles, an overhead conveyor system for transporting conveying pockets, and an order-picking area in accordance with the ware-to-person principle, where a number of articles specified by a control computer can be order-picked into conveying pockets at the order-picking area. The storage rack is modular and in the form of independent individual racks. A transport robot is autonomous or controlled by the control computer and constructed to pass beneath an individual rack and/or a transport trolley and transport the individual rack and/or the transport trolley to the order-picking area an article stored in the individual rack and/or an article order-picked from the storage rack into the transport trolley in advance is to be order-picked into a conveyor pocket at the order-picking area.