This paper deals with reusability of the DEVS (Discrete Event Systems Specification) models in the hierarchical models development framework within an object-oriented simulation environment, called DEVSim++. The DEVS1m++ environment supports models reusability in two dimensions during models development. One way of reusability is achieved from the hierarchical model construction technology from the DEVS formalism and the other from the inheritance mechanism from the underlying object-oriented

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... vironment. This paper proposes a set of metrics to measure both hierarchical reuse and inheritance reuse of DEVS models developed in DEVSIin++. It also suggests a set of guidelines to improve reusability. Empirical measurement of the proposed metrics shows that the guidelines improve reusability of DEVS simulation models in the DEVSim++ environment.