1. A computer-implemented method for analysis of process data, which is generated by executing real processes and is stored according to a predetermined data structure as process protocol in a storage means of a computer system, wherein the storage means is coupled to a processor of the computer system operatively, wherein the process data comprise a number of process instances, wherein each process instance comprises a number of process steps, wherein the predetermined data structure comprises at least: 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; wherein the method comprises: receiving, by the computer system, an APE statement (Advanced Process Algebra Execution), wherein the APE statement defines a query of process instances from the storage means, and wherein the APE statement comprises at least one process operator; executing, by the processor, the APE statement and reading the process instances according to the APE statement from the storage means; and providing the result of the query for further processing.