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CISA® Certified Information Systems Auditor®: Study Guide, Third Edition by David Cannon

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Program Architecture

Computer programs may be written with an open architecture or proprietary, also known as closed, design. The software architect makes this decision.

The open system architecture is founded on well-known standards and definitions. The primary advantage of open architecture is flexibility. Computer software can be updated and modified by using components from multiple sources. Fortunately, the design promotes the ability to use best-of-breed programs. The disadvantages include having a potential hodgepodge of unstructured programs. For a client, the open system architecture reduces dependence on a particular vendor.

A closed system architecture contains methods and proprietary programming that remain the property of the software ...

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