The trend of evolution and progress in organizational quality and excellence has led to six-sigma philosophy, which is an effective way to improve and develop the organizational capabilities and capacities. One of the most important topics of six-sigma is choosing the right projects. A six-sigma project is about appropriate deciding to solve a problem systematically, which has a set of specific criteria. These criteria can be used either as the project's objectives, or as means to analyze the project progression. Choosing six-sigma projects is like setting the first row of bricks in a wall, that if it is done in a scientific and systematic manner, effectiveness in six-sigma project implementation phase is gained substantially which ultimately promotes the quality of organizational processes. This article outlines efficient approaches to selecting and defining six-sigma projects, and the most debated criteria in this field

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