A computer-implemented method is provided for storing process data. The method comprises allocating a storage area for the process data in the storage means, loading the process data, from the at least one source system, and storing the process steps according to a predetermined data structure in the allocated storage area of the storage means. The predetermined data structure comprises a first attribute, in which a unique identification of the process instance of the respective process step is stored, a second attribute, in which an identification of the respective process step is stored, and a third attribute, in which the sequence of the process steps within a process instance is stored. The method then sorts the process steps in the allocated storage area, wherein the process steps are first sorted according to the first attribute, and subsequently, according to the third attribute.