Nowadays, there exist modeling techniques that provide good support for the requirements elicitation and analysis of complex scenarios, such as the i* modeling framework. However, the application of these requirements models into Model-Driven Development (MDD) processes is still dependent on the experience of analysts and designers to manually transform the defined requirements models into an appropriate MDD model. Certain approaches have proposed guidelines to facilitate and partially automate this translation, but there is a lack of validation rules establishing how to build i* models for an improved generation of the corresponding MDD models. Thus, in this paper, we propose a set of metrics that are oriented to validating the adequacy of i* models as the starting point for MDD processes, as well as a process for the application of the proposed metrics in the i* framework.