International double taxation represents one of the main problems’ for which taxpayers have to deal within a world fulfilled with globalization, uncertainty, risk, asymmetrical information and moral hazard. In this sense, in this article it is provided a qualitative overview regarding the appearance and evolution of the main double taxation conventions and their legal framework. In this article it is tackled some important issues, namely: the rationale behind the construction and engaging in double taxation conventions; the need for a coherent and just application of those conventions; the historical appearance and evolution of the double taxation conventions, as well as the quid pro quo OECD Model Convention and UN Model Convention. The co...