Currently one of the most relevant fields in the study of democracy is its quality. Therefore, conceptual assumptions were formulated to define it as a starting point and dialogue between various authors. Additionally, a literature review was made about the development and evolution of this concept. The tracking was conducted to investigate about "quality of democracy" and which factors and indicators have been used to measure its usefulness. The findings showed that the studies on democracy start from an operative definition based on the concept of polyarchy, which has allowed it to delimit its object of study and focus on institutional aspects under conceptual postulates from at least three different analysis approaches. Retraction Note: "The Editors have retracted this article because do not fulfill the editorial protocol of peer review process"