SOA

Biz View: a set of services that a business wants to expose to their customers and partners, or other portions of the organization
Architecture view: a set of architectural principles, patterns and criteria which address characteristics such as modularity, encapsulation, loose coupling, separation of concerns, reuse, composability and single implementation
Implementation View: a programming model complete with standards, tools and technologies such as Web Services
An SOA is composed of multiple layers. At the heart of the SOA is the Service Model that defines Services and Components that realize them

Service modeling – what we model
Layer 1 which is the bottom layer describes operational systems. This layer contains existing systems or applications including existing CRM and ERP packaged applications, legacy applications and “older” object-oriented system implementations as well as business intelligence applications. The composite layered architecture of an SOA can leverage existing systems, integrate them using service-oriented integration.
Layer 2 is the component layer which used container–based technologies and designs used in typical component-based development.
Layer 3 provides for the mechanism to take enterprise scale components, business unit specific components and in some cases project specific components and provides services through their interfaces. The interfaces get exported out as service descriptions in this layer, where services exist in isolation or as composite services.
Level 4 is an evolution of service composition into flows or choreographies of services bundled into a flow to act as an application. These applications support specific use-cases and business processes. Here, visual flow composition tools such as WebSphere WBI-Modeler can be used for design of application flow.
Layer 5, the presentation layer is usually out of scope for an SOA. However, it is depicted because some recent standards such as Web Services for remote Portlets version 2.0 may indeed leverage Web Services at the application interface or presentation level. It is also important to note that SOA decouples the user interface from the components.
Layer 6 enables the integration of services through the introduction of a reliable and intelligent routing, protocol mediation, and other transformation mechanisms often described as the Enterprise Service Bus .
Layer7 ensures quality of service through sense-and–respond mechanisms and tools that monitor the health of SOA applications, including the all important standards implementations of WS-Management.