METRIC OF ADAPTABILITY FOR CYBER-PHYSICAL SYSTEMS The subject of this research effort addresses one of the specific METAII objectives, a metric for adaptability. DARPA defines adaptability, in context of this program, as the ability of a system to change easily, quickly, and inexpensively (i.e., with minimum incurrence of cost and degradation in performance) in response to a wide spectrum of anticipated and unanticipated perturbation events exogenous or endogenous to the system. Donna H. Rhodes and Adam M. Ross 
 Massachusetts Institute of Technology