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The adoption of Cloud computing as a new business model has induced the proliferation of several Cloud service providers. Cloud end users are then faced with choosing the appropriate provider offers in terms of supported technologies, geographic locations, security, access rules, billing, etc. In this paper, we propose a new Cloud broker called CompatibleOne which provides solutions to assist Cloud end users in their providers choice. The CompatibleOne broker is based on open standards, mainly CDMI and OCCI, and uses our new defined object-based description model called CORDS. CORDS serves to model and manage the various Cloud resources that manipulates the main CompatibleOne platform called ACCORDS. We motivate our solution with real use case scenarios and an implementation to show its feasibility.