George W. McCarthy in his article titled "Toward a Theory of Urban Evolution" recognized the lack of development in the scientific approach to cities. He also describes how Evolutionary Theory can lead to a better understanding of urban phenomena in order to increase their resilience and adaptability.  In the first part of the article, McCarthy makes reference to the academic work of Lewis Mumford named " What is a city?" in 1937 to prove the lack of advancement in Urban Evolution Theory. Mumford visioned transforming chaotic and mass populated cities into articulated and polynucleated metropolis using evolutionary approaches. It has passed 80 years since Munford wrote his article but urbanism has not been able to create a scientific study of the city beyond the basic narrative of its conditions. McCarthy claims the existence of an extensive academic work of cities from different scientific fields, however, those works felt in the simple description of cities without a systematic approach to their complexity or without a real understanding of how cities transform the way as they do. McCarthy recognizes the Laura Bliss's work named " City Lab"  as the rudimentary taxonomy of cities. He also uses the work of Jane Jacobs in "The Death and Life an Ecology Cities" to claim it as a simple historical description of big cities. McCarthy is not optimistic about the effectiveness of the implementation of an important planning tool like The New Urban Agenda, a result of the third UN Habit conference headed the past year in Quito, Ecuador, without the consolidation of a city science. Seeing a serious lack of scientific approach to cities, McCharty suggests some guidelines from Evolutionary Theory to narrow down the scientific study of cities. Natural selection, gene flow, mutation, and random drift are the main forces that evolutionary theory can contribute to the understanding of urban phenomena. Natural section seeing how cities react to external inputs such as global warming, globalization, economic dynamics, etc. Gene flow as the migration process in urban areas and the interaction of diversity, and cultural difference. Mutation, on the other hand, makes reference to the advancement or disruption of technological change. Finally, random drift is the association of those social and cultural changes and how new intercultural activities can chance cultural identity through the passing of time.