An automated modular storage library is formed by a plurality of available library elements. Each available library element is selected from a predetermined limited subset of library elements made available for library assembly. This creates a library that is modular by restricting the library elements used during assembly to the limited subset of library elements. According to a partial audit principle, an area where an intervention is to be performed may be physically separated prior to the intervention. After the intervention, the partial audit is conducted in a separated area where the intervention occurred, as the remainder of the library was protected during the intervention by the physical separation.