A system for storing and organizing materials comprising: at least two tiers arranged on top of each other comprising a first tier and at least one further tier that is arranged below the first tier, each of which comprises a plurality of storage places arranged in rows in two horizontal directions perpendicular to each other, a plurality of boxes accommodated individually in these storage places and at least two, preferably all, tiers comprise the storage places; wherein a first transport network with a plurality of first rail tracks crosswise connected and horizontally arranged within each tier is provided, the first rail tracks are adapted to accommodate mobile transporting devices for their transportation; wherein each of the plurality of mobile transporting devices is adapted to pick up and accommodate at least one box from a storage place and move the accommodated box along the respective first rail tracks towards, away and/or between the storage places of the tier, wherein the first transport network of each tier is also provided below the position of a storage place and wherein mobile transport devices by themselves are adapted to pass through below a stored box in a storage place on the first transport network from one side of the storage place to the opposite side; wherein at least partially above the first tier an assembly area is provided; the assembly area comprises a second transport network, with a plurality of second rail tracks oriented horizontally and parallel to each other, adapted to accommodate mobile actuating devices along them for their transportation, wherein each of the plurality of mobile actuating devices is provided with a gripper adapted to grab and transfer at least some content of a box within the first and/or any further tier arranged below the first tier, while such box and one of the mobile actuating devices are arranged above each other. at least two tiers arranged on top of each other comprising a first tier and at least one further tier that is arranged below the first tier, each of which comprises a plurality of storage places arranged in rows in two horizontal directions perpendicular to each other, a plurality of boxes accommodated individually in these storage places and at least two, preferably all, tiers comprise the storage places; wherein a first transport network with a plurality of first rail tracks crosswise connected and horizontally arranged within each tier is provided, the first rail tracks are adapted to accommodate mobile transporting devices for their transportation; wherein each of the plurality of mobile transporting devices is adapted to pick up and accommodate at least one box from a storage place and move the accommodated box along the respective first rail tracks towards, away and/or between the storage places of the tier, wherein the first transport network of each tier is also provided below the position of a storage place and wherein mobile transport devices by themselves are adapted to pass through below a stored box in a storage place on the first transport network from one side of the storage place to the opposite side; wherein at least partially above the first tier an assembly area is provided; the assembly area comprises a second transport network, with a plurality of second rail tracks oriented horizontally and parallel to each other, adapted to accommodate mobile actuating devices along them for their transportation, wherein each of the plurality of mobile actuating devices is provided with a gripper adapted to grab and transfer at least some content of a box within the first and/or any further tier arranged below the first tier, while such box and one of the mobile actuating devices are arranged above each other.