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Tool Description

The Modular Open Systems Approach Program Assessment Tool (PART) was adapted from the former OMB Program Assessment Rating Tool.  The MOSA PART is an analytical tool for use by DoD Program Managers to assist in assessing their implementation of MOSA across the Acquisition Life Cycle.

The Modular Open Systems Approach Program Assessment Tool (PART) will assist DoD Program Managers to in identifying the degree of their MOSA implementations according to the OSJTF's five key MOSA indicators:  Modular Design, Key Interfaces, Open Standards, Conformance, and Enabling Environment.



The OAAT is a tool designed to assist Navy program managers in assessing the "openness" of their programs. It aligns to the Open Architecture Assessment Model (OAAM) as approved by ASN(RDA) and provides a reproducible and objective method of conducting program assessments. OAAT 3.0 represents a revision to and replacement for OAAT versions 1.0/1.1 and 2.0. Version 3.0 of the tool incorporates changes that streamline and clarify the questions to make them easier to understand, increase tool usability using modified answered selectors, and provide end users visibility into the OAAT score capping mechanism. The supporting materials associated with the OAAT have been updated to reflect these revisions. A discussion of the OAAT Capabilities and Limitations (Appendix G) and a Glossary of OAAT Terms (Appendix H) have also been developed to support the use of OAAT 3.0.

Changes incorporated into OAAT 3.0 should help reduce the effort required for programs to complete the OA assessments. Major modifications include:
a. Streamlining and clarification of the questions and responses;
b. Deletion of two questions that were determined to be ineffective;
c. Revisions to question explanations and answers;
d. Shift of answer text to selector fields on programmatic tab (consistent with technical tab); and
e. Notification flag added to total score screen to indicate score capping.

As was the case in OAAT 2.0, programs previously assessed using OAAT 1.0/1.1 may observe a change in scores along both the Business (Programmatic) and Technical axes when conducting follow up assessments using OAAT 3.0. This behavior results from adjustments to the scoring model which were implemented in OAAT 2.0 to improve the consistency of results across the enterprise and better calibrate the tool to the desired descriptive model of OA status. Programs previously assessed using OAAT 2.0 should observe minimal to no change in score when assessed using OAAT 3.0. Changes made to the scoring model are described in detail in Appendix C of the Users Guide.

The interactive features of this page are available to you, members of the community, to discuss common issues, share your experiences, and help each other as you learn together how to use the tool and assess your programs. The Open Architecture Enterprise Team (OAET) is also available to interact and provide assistance. To report issues with the the tool and make recommendations for changes, please use the feedback process below to help us track each issue to its resolution.

We encourage all program managers and Navy contractors to use the tool and submit feedback on their experiences with it, both good and bad, by free form email to

Clicking on the link below will enable you to download a zip folder containing the OAAT and all of its supporting documents. Please be sure to first read the "README FIRST" file before using the OAAT because it contains important information regarding settings on your computer to enable the tool's optimum functionality.

Important Information: Despite the set-up procedure described in the README FIRST file, those who will be using the Open Architecture Assessment Tool (OAAT) with EXCEL 2000 must set the Macro Security level on the 'Tools' menu to 'Low' not 'Medium.'

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