A SvcV-3a enables a quick overview of all the system-to-service resource interactions specified in one or more SvcV-1 “Services Context Description” models. The SvcV-3a provides a tabular summary of the system and services interactions specified in the SvcV-1 for the Architectural Description. This model can be useful in support existing systems that are transitioning to provide services. The matrix format supports a rapid assessment of potential commonalities and redundancies (or, if fault-tolerance is desired, the lack of redundancies). 
The SvcV-3a can be organized in a number of ways to emphasize the association of system to-service interactions in context with the architecture’s purpose.
The intended usage of the SvcV-3a includes: 
- Summarizing system and service resource interactions
- Interface management
- Comparing interoperability characteristics of solution options
The SvcV-1 concentrates on Service resources and their interactions, and these are summarized in a SvcV-3a or SvcV-3b. The SvcV-3a DoDAF-described Model can be a useful tool for managing the evolution of solutions and infrastructures, the insertion of new technologies and functionality, and the redistribution of Systems and Services and activities in context with evolving operational requirements. 
Depending upon the purpose of the architecture, there could be several SvcV-3a DoDAF described Models. The suite of SvcV-3a models can be organized in a number of ways (e.g., by domain, by operational mission phase, by solution option) to emphasize the association of groups of resource pairs in context with the Architectural Description’s purpose. 
The SvcV-3a is generally presented as a matrix, where the System and Services resources are listed in the rows and columns of the matrix, and each cell indicates an interaction between Systems and Services if one exists. Many types of interaction information can be presented in the cells of a SvcV-3a. The resource interactions can be represented using different symbols and/or color coding that depicts different interaction characteristics, for example: 
- Status (e.g., existing, planned, potential, de-activated)
- Key interfaces
- Category (e.g., command and control, intelligence, personnel, logistics)
- Classification-level (e.g., Restricted, Confidential, Secret, Top Secret)
- Communication means (e.g., Rim Loop Interface, Scalable Loop Interface)
|DoDAF Viewpoint Matrix|
- The DoDAF descriptions in this website are very generic and are mostly taken from the DoDAF Architecture Framework website. Make sure you visit the actual website for the most update information and a more thorough explanation of each viewpoint.
- DoDAF Version 1.0, although outdated, has some good examples on how to construct AV’s, OV’s, and SV’s.
AcqLinks and References:
-  DoDAF Architecture Framework Version 2.02
- DoD Architecture Framework Working Group Version 1.0, Volume 1: Definition and Guideline, 9 Feb 04 (Old Version)
- DoD Architecture Framework Version 1.0, Volume 2: Product Description, 9 Feb 04 (Old Version)
- Website: DoDAF Architecture Framework – DoD Deputy Chief Information Officer
- Website: DoDAF Version 2.02 Journal