Transparency International Sri Lanka recently commissioned a policy brief on “Adapting a Mixed Member Proportional (MMP) Electoral System in Sri Lanka”. With heightened dialogue on the country’s proposed constitutional and electoral reforms under the 20th amendment and the propositions to adapt an MMP system highlighted in President Maithripala Sirisena’s mandate, this study was commissioned with the purpose of deconstructing the complexities of an MMP system and to highlight the fundamental principles required in adapting an internationally recognized MMP system. While the study gives a good insight on how an MMP system can function it also discusses the flaws in the 20th Amendment on the recommended structure and principles of the proposed MMP system, where the reforms call for components that do not necessarily fit within the ideal MMP principles i.e. open lists as opposed to a closed list, a single ballot as opposed to a dual ballot etc. Therefore the content of the study reflects the rationale for a closed list, dual ballot MMP system and analyzes in depth the nuances of the MMP system while also shedding light on the misconceptions associated with adapting MMP in Sri Lanka. The paper was produced by Verite Research (Pvt) Ltd and TISL hopes to utilize the recommendations made in this paper in its advocacy strategies aimed at lobbying for an internationally recognized MMP system with a dual ballot and a closed list with a considerably proportional ratio of First Past the Post (FPTP) candidate seats and Proportionally Represented (PR) party seats.