XOA stands for experience-oriented architecture. XOA was first coined by Adobe’s Steven Webster “to very specifically mean applying design thinking to evolving an architecture stack, and more recently, to talk about instrumenting an experience in order that it can be measured and monitored as delivering against intended KPIs.” It is therefore incorrect to reduce XOA down to component development. At its heart, XOA embodies best practices for RIA development, whether in the browser or on the desktop.
In the (just-announced) AdobeÂ® Digital Enterprise Platform, XOA manifests its RIA best practices via layers (concerns) as follows:
- Presentation – view rendering
- Domain – client-side computations, abstraction of server calls, etc.
- Infrastructure – server communication
XOA is an architectural approach and is not bound to a particular technology (e.g. applies to Flex, HTML5, native mobile, etc.). XOA is certainly not meant to be a formal label–just like you wouldn’t expect to see “SOA” in XML, etc.
This layered architecture  provides an efficient way of segregating the code related to view rendition, client side computations, perpetual asynchronous communication, etc. Embracing such separation of concerns enables ADEP development projects to be easier to understand and to manage. Moreover, it helps developers with different personas to work in tandem on a component (e.g. the UI developer in concert with a business logic developer).
Example of applying XOA to ADEP-based Flex development: Enterprise Flex components (aka UX (User Experience) Components) are mostly data-driven with data synchronizing from a backend server over Remoting, Data Services, etc. With data coming from server in an asynchronous fashion and component assembling itself by computations, the complexity increases manifold since the component, apart from rendering itself also needs to construct itself. Therefore, it becomes extremely important to separate concerns before the component development turns unmanageable. However, please keep in mind that XOA is about much more than component development as noted above.
For example, a UX Component in ADEP is an enterprise Flex component that embodies XOA principles.
More on UX Components and other aspects of ADEP in future posts…
Update 6/30/2011: “What is a UX Component?”
 You may recall that I spoke about XOA during my MAX 2010 session, “Realizing great customer experiences with LiveCycle ES3.” (ADEP replaces “LiveCycle ES3.” ADEP is the new brand that incorporates aspects of LiveCycle with aspects of the Day Software aquisition.)-Craig