Vitality is one of the main components in design, but it is a complex and multifaceted concept that overlaps in its physical, social and economic dimensions. Therefore, in this paper, according to the theoretical vacuum of this concept in architecture and considering its interdisciplinary nature, using the model of various types of communication and types of vitality, the fields of psychology and sociology were selected for comparative study of vitality. Then, by using the comparative method by juxtaposing the differences and similarities of vitality in the field of psychology and sociology with definitions in architecture and urban planning, as well as examining the difference between vitality and other similar concepts in architecture and urban planning, including quality. Life, viability, and sustainability were ultimately represented by the definition of vitality and the model of environmental vitality. Therefore, the present study was performed with interpretive paradigm, qualitative approach, comparative method and logic of deductive reasoning, which is explained in terms of theoretical purpose and type of results. The purpose of this study is to answer questions about the definition of environmental vitality, the appropriate approach to research on vitality, the appropriate scale of vitality research, the factors affecting environmental vitality and its evaluation methods.