The Application Layer Communications). As the table shows, on the sizes shown, an ESOA is a model of the Software as a Service (SaaS) level of the Private Cloud, while the ISOA is a style of the SaaS of the general public Cloud. Consequently, Cloud and SOA Computing could be the same at the SaaS layer.

In a Part 3 of the four-part paper, The Future of IT: Enterprise Architecture 2006 to 2026, Part 3: Model and Event Driven Architecture (2008 to 2017), The Journal of Business Architecture (February 2007), p. 28-39, I posit Model and Event Driven Architecture as an outgrowth of SOA.

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This is an integration of Model Driven Architecture as espoused by the thing Management Group and a broadly discussed, but somewhat nebulous Event Driven Architecture. The current concept of Model Driven Architecture (MDA) starts from IT functional requirements, as modeled in UML diagrams and eventually ends up with a whole application to roll into production. Regarding SOA, using MDA means that the software programmers create the Service Components using MDA and put together these components into a Composite Application using orchestration based on MDA. Actually, modeling the assembly of the amalgamated application is an instant way to spot both coding and system practical design flaws.

However, in a broader interpretation of MDA, implementers of new systems, application, and/or services could focus on Business Process Modeling to identify business process requirements and functions and use these to derive the IT functions. This allows the Systems Engineer and System Architect to capture more complete requirements and trace the IT functions to the business or organizational functions they support. This modeling idea fulfills the procedure envisioned for SOA better, than using MDA to create the composite applications simply.

Event Driven Architecture (EDA) targets creating agile software, that is, software that can react to external stimuli regularly successfully. To perform this mission, an EDA must be able to dynamically change both functions it performs and the ordering of these functions in response to the stimulus.

This function falls along the branching logic dimension, which at one extreme is the simply “IF” declaration with the other is Artificial Intelligence (AI). Obviously, the ideas from Knowledge Management (KM) will come into play with the functions along these dimensions. The key to EDA is determining what really constitutes an event. This requires Complex Event Processing (CEP). In conditions of the OODA Loop, CEP constitutes the OO portion (“Observe” and “Orient”). Actually, EDA can support three of the four functions of the OODA based on the idea of types of “event” rules.