In this study we present an adaptation of ASDI (Analysis-Specification-Design- Impelmenation) methodology to the Cloud Manufacturing domain. Cloud Manufacturing is an emerging paradigm in which dynamically scalable and virtualized manufacturing resources are provided to the users as services over the Internet. In order to implement a Cloud Manufacturing platform that will map manufacturing users and providers we propose a modeling methodology named ASDI-Onto. It uses ontologies as modeling approaches to model the Cloud Manufacturing domain and introduce the outlines of the future work.