Considering alternative strategies for value sustainment in systems-of-systems

Systems of Systems (SoSs) operating in an uncertain world must overcome a variety of challenges in order to sustain value delivery over time. This paper describes strategies for value sustainment, using an application of the “wave model” to represent time-varying SoS Engineering (SoSE) activities and opportunities for SoS-change. A Maritime Security (MarSec) SoS case study is described, and simulation-based Era Analysis is used to evaluate SoS alternatives through different operational environments for an assumed 8-year time frame. Eight SoS designs are evaluated and compared across four strategies in terms of accumulated utility, discounted cost, and total down time. The four value sustainment strategies are: (1) self-recovery, the SoS is not changed (i.e., relating to survivability/robustness); (2) changes in the design of the SoS are allowed (i.e., relating to changeability); (3) changes in the architecture of the SoS are allowed (i.e., relating to evolvability) once, or (4) three times in the eight years. The results provide an example of how quantitative approaches can be used to gain insights into tradeoffs in how SoS architects can create value-sustainable SoSs for the long run.

[1]  John Klein,et al.  Army Workshop on Exploring Enterprise , System of Systems , System , and Software Architectures , 2009 .

[2]  Daniel E. Hastings,et al.  Examining Survivability of Systems of Systems , 2011 .

[3]  Kristen Baldwin,et al.  An implementers' view of systems engineering for systems of systems , 2011, 2011 IEEE International Systems Conference.

[4]  Mark W. Maier,et al.  Architecting Principles for Systems‐of‐Systems , 1996 .

[5]  Matthew E. Fitzgerald,et al.  8.4.1 Assessing Uncertain Benefits: a Valuation Approach for Strategic Changeability (VASC) , 2012 .

[6]  Adam M. Ross,et al.  Combining Attributes for Systems of Systems in Multi-Attribute Tradespace Exploration , 2010 .

[7]  Barry Boehm,et al.  Using the Incremental Commitment Model to Integrate System Acquisition, Systems Engineering, and Software Engineering , 2007 .

[8]  Daniel E. Hastings,et al.  Responsive Systems Comparison Method: Case Study in Assessing Future Designs in the Presence of Change , 2008 .

[9]  Jay Clark Beesemyer.  Empirically characterizing evolvability and changeability in engineering systems , 2012 .

[10]  M. E. Fitzgerald,et al.  Sustaining lifecycle value: Valuable changeability analysis with era simulation , 2012, 2012 IEEE International Systems Conference SysCon 2012.

[11]  Daniel E. Hastings,et al.  Investigating Alternative Concepts of Operations for a Maritime Security System of Systems , 2012 .

[12]  Brian Mekdeci,et al.  Managing the impact of change through survivability and pliability to achieve viable systems of systems , 2013 .

[13]  Steven J. Hutchison.  Test and Evaluation at the Speed of Need , 2010 .