Int. J. of System of Systems Engineering   »   2014 Vol.5, No.1



Title: Modelling and measuring the operability of interdependent systems and systems of systems: advances in methods and applications


Authors: Paul R. Garvey; C. Ariel Pinto; Joost Reyes Santos


The MITRE Corporation, 202 Burlington Road, Bedford, MA 01730-1420, USA
Old Dominion University, 241 Kaufman Hall, Norfolk, VA 23529, USA
George Washington University, 1776 G St NW, Washington, DC 20052, USA


Abstract: Interdependency is an important consideration in managing systems and systems of systems. Included in this consideration is identifying, representing, and measuring the ripple effects of dependencies between systems and consumers who rely on their products and services. Anticipating these effects enables planners to minimise dependency risks that, if realised, can have cascading impacts on the ability of systems to deliver services. This paper presents advances in modelling interdependent systems by integrating two methods: functional dependency network analysis (FDNA) and the inoperability input-output model (IIM). Their integration enables hierarchical modelling of perturbations to systems at the physical or operational network levels. To highlight the insights gained by integrating FDNA and IIM, a simulated electric power system that feeds a large metropolitan area is presented. This simulated case demonstrates that other consequence measures, such as the inoperability metric presented herein, must be used in conjunction with monetary objectives to generate holistic prioritisation strategies.


Keywords: systems engineering; engineering management; dependency risks; interdependent systems; systems of systems; enterprise systems; inoperability input-output model; IIM; functional dependency network analysis; FDNA; modelling; interdependent systems; simulation.


DOI: 10.1504/IJSSE.2014.060880


Int. J. of System of Systems Engineering, 2014 Vol.5, No.1, pp.1 - 24


Submission date: 15 Apr 2013
Date of acceptance: 10 Sep 2013
Available online: 02 May 2014



Editors Full text accessAccess for SubscribersPurchase this articleComment on this article