Histories consist of a number of process boundaries. We assume that any history can be embedded into a process, which then forms a foundation of the history. If it were not for this foundation, one would face the problem of singling out the right boundaries in order to get a natural history: It is not sensible to measure the temperature of a patient first, then determine his weight, followed by measuring his blood pressure and to consider these strangely arbitrary process boundaries as a history of the patient's body data.