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The suppliers, which are one of the most important actors in the supply chain, have a significant effect on the performances of their customer firms. Hence, supplier performance evaluation has become a competitive tool in today's goods and service producing industries. This paper presents a supplier performance evaluation process developed using the Six Sigma Define – Measure – Analyse – Improve – Control (DMAIC) methodology. The proposed process has been applied in a central services company, where the suppliers had never been evaluated before. To this end, first of all, the evaluation criteria have been defined through brainstorming and meetings within the company, then weighted with Analytical Hierarchy Process (AHP), and categorized according to Kano's Model. Afterwards, suppliers have been scored and classified based on a proposed methodology using a modified version of Kano's model, and thus, the proposed process has proven to be useful in real life industrial applications.

The utilization of renewable energy sources (RES) has become inevitable, not only due to the increasing scarcity of fossil fuels, but also to sustain life on Earth. Consequently, countries have started developing renewable energy policies individually and as part of global organizations and networks, such as the Organization for Economic Cooperation and Development (OECD), the European Union (EU) and the International Energy Agency (IEA). Turkey is a developing OECD member country and in the accession process to the EU. Thus, the renewable energy policies should be aligned with those of the EU. Moreover, despite the substantial amount and wide range of RES, it is still in a position to import more than half of its energy demand. In the light of these facts, this study aims to analyze and compare the renewable energy policies in Turkey with those adopted worldwide to lay out possible solutions regarding its energy problems.

Sustainability concerns resulting from the consumption of natural resources, life-threatening levels of pollution, global warming, climate change and the ever-increasing worldwide energy use have brought renewable energy sources to forefront. Given the possibility of depletion of fossil fuels in the near future, the utilization of clean and renewable energy sources have become inevitable. Consequently, governments and global organizations adopted respective regulations to ensure the production and use of renewable energy and promote the respective new investments. In the light of these developments, the aim of this study is to conduct a detailed review and evaluation on the current literature and global energy statistics. The respective projects, binding regulations, incentives, and pricing mechanisms have also been studied to analyze and compare the renewable energy policies adopted worldwide. Ultimately, the goal is to make certain suggestions and lay out possible solutions regarding global energy problems.