Methods, systems and computer program products to measure the adaptability of complex systems, including systems of systems, are disclosed. The methods, systems and computer program products provide rigor and defensibility to the analysis and assessment of adaptability. As a result, systems can be designed or acquired that are intrinsically more adaptable and better able to respond to changing environments.
 This invention was made with Government support under Contract No. DE-AC04-94AL85000 awarded by the U.S. Department of Energy. The Government has certain rights in the invention.