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Real-Time & Embedded Systems Forum

Objective of Meeting

The primary objective of Tuesday’s Open Track sessions on Dependability was to look at a variety of new approaches – from Dependability Engineering for Open Systems (DEOS) to the use of safety cases and assurance cases – as well as looking at the use of industry tools and techniques and modeling languages that can be used to enable the various approaches, and how Real-Time and Embedded Systems including the DEOS application can be looked at from the TOGAF® perspective.


1400-1440: Introduction to the Dependability Engineering for Open Systems (DEOS) Project – Architecture to Dependability (Jack Fujieda, Chairman, The Open Group, Japan)

Jack Fujieda provided a very good introduction to the DEOS work that was presented in more technical detail by Dr. Matsuno in the follow-on session.  Mr. Fujieda stressed the technical and business value in Architecting for Dependability, that you should create more assurance from the beginning in architecting and designing rather than adding it later when it may be too late after costly errors surface during operation.

Jack Fujieda’s presentation on the Dependability Engineering for Open Systems (DEOS) Project can be found here.

1440-1540: DEOS and D-Case (Dr. Yutaka Matsuno, University of Tokyo)

Dr. Matsuno provided excellent presentations on how to increase the dependability of Open Systems through the (DEOS) approach. Instead of using the typical formal methods approach, which they believe assumes a closed system, they advocate for an approach where the level of dependability should be agreed by stakeholders with the help of assurance cases in the design and operational phases. And, based on assurance cases, they have started to develop D-Case which is a method and tool for dependability agreement among stakeholders. They also discussed a graphical notation, the Goal Structuring Notation (GSN), which is a safety argument notation. Additionally, they covered the level of risk or dependability, which can be determined by introducing a monitor into the system to gather evidence on the system’s dependability. The presentation introduced their demo of a D-Case system and discussed their plans for standardization as follows: D-Case/Ada available in early 2012 as open source, and plans for a Dependability plug-in for TOGAF®, which could be an instantiation of the DEOS process.

Dr. Matsuno’s presentations on DEOS and D-Case for Open Systems Dependability are available below:

1600-1630: Enhancements to D-Case (Ed Roberts, Elparazim)

Ed Roberts expanded on the presentations that were given by Dr. Matsuno and Mr. Fujieda, and talked about what could be done to enhance the existing DEOS D-Cases.

1630-1700: A Dependability Framework for TOGAF (Ed Roberts)

Ed Roberts gave a great presentation on the benefits of evolving TOGAF® to the Platform – and talked about if we did extend TOGAF to the platform how it would provide a framework for real-time and high-assurance architects, who are developing solutions for higher assurance environments. His presentation answered the questions: Why do we care to connect TOGAF to the Platform? What does that mean? What needs to be done to affect that connection? What is currently being done concerning this in the RTES and Architecture Forums?

Ed Roberts’ presentation can be found here.


The outputs are reflected in the Summary and Next Steps.

Next Steps

The Real-Time and Embedded Systems Forum will continue to increase awareness within technical communities and standards organization to leverage – and evolve – the excellent work started by SONY, the University of Tokyo, and Elparazim in the use of DEOS and D-Cases.

Ed Roberts will be furthering Architecting to the Platform efforts within both the RTES Forum and the Architecture Forum as appropriate.


See above.

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