Companies using domain specific languages in a model-driven development process need to measure their models. However, developing and maintaining a measurement software for each domain specific mod- eling language is costly. Our contribution is a model-driven measurement approach. This measurement approach is model-driven from two view- points: 1) it measures models of a model-driven development process; 2) it uses models as unique and consistent metric specifications, w.r.t a metric specification metamodel. This declarative specification of metrics is then used to generate a fully fledged implementation. The benefit from applying the approach is evaluated by two applications. They indicate that this approach reduces the domain-specific measurement software development cost.