Data Model Patterns by Hay David C

Author:Hay, David C. [Hay, David C.]
Language: eng
Format: epub
ISBN: 978-0-08-047703-9
Publisher: Elsevier Ltd.
Published: 2006-09-14T16:00:00+00:00

Fig. 3-16 System event types.

As mentioned previously, we are here only concerned with event types, the definition of types of events. The example is about the idea of receiving books, not an actual receipt on July 18. Note that the MANAGEMENT ROLE that applied to BUSINESS PROCESS also applies to SYSTEM PROCESS.

Essential System Processes

In speaking of FUNCTIONS and BUSINESS PROCESSES previously, much was made of the fact that at the lowest level one could find ELEMENTARY FUNCTIONS and ELEMENTARY BUSINESS PROCESSES. As shown in Figure 3-17, something similar may be found in analyzing the hierarchy of SYSTEM PROCESSES—the ELEMENTARY SYSTEM PROCESS. As with ELEMENTARY FUNCTIONS and ELEMENTARY BUSINESS PROCESSES, an ELEMENTARY SYSTEM PROCESS is the smallest unit of work that retains its identity. You can identify this most atomic process by realizing that once started it is not meaningful to say that it can be stopped before it is completed. Thus, each OTHER SYSTEM PROCESS may be composed of either one or more OTHER SYSTEM PROCESSES, ESSENTIAL SYSTEM PROCESSES, and/or ELEMENTARY SYSTEM PROCESSES.

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