Introduction
Co-evolution is one of the scientific concepts that is adapted from biological ecosystems in the field of organization and as one of the relationships that has received much attention in recent years in ecosystems. Ecosystems as an evolutionary system consist of several parties, including actors, technologies, and institutions, which are trying to interact and survive through competition and cooperation. This research aims to, by relying on the research literature of business ecosystem and co-evolution in organizational populations, various components and dimensions of the concept of co-evolution in business ecosystems, which in many researches It has been dealt with in a scattered way in an overview and to answer the following main question: What are the dimensions of co-evolution in the business ecosystem? And what factors are involved in the emergence of this phenomenon in the business ecosystem?
Methodology
This research is fundamental in terms of its purpose, and in terms of data collection, it is systematic review-documentary research. In order to identify the components of the concept of co-evolution in ecosystems, this research has used the systematic review method along with the content analysis of key articles in this field. 
 Results and Discussion
By referring to Scopus and Google Scholar database, articles related to selected keywords were extracted and analyzed. In the first step, 881 articles were identified, and after filtering articles with different indexes, the number of articles that could be analyzed was reduced to 25 articles. The texts of 25 selected key articles entered the content analysis phase. Based on the results of this research, 5 main themes of the concept of co-evolution including mechanisms, nature, characteristics of ecosystem actors and 27 subcategories were extracted. Co-evolutionary mechanisms that actually express how this phenomenon is formed in ecosystems is "learning based on positive feedback and intelligence".
Among the 27 sub-categories, 12 categories with high repetition were identified and based on this, a comprehensive definition of the nature and concept of co-evolution in business ecosystems was presented. Based on this definition, the concept of co-evolution in the business ecosystem based on the 4 main dimensions of "change, interaction, learning and multi-level" as "simultaneous, stable and permanent change and development between diverse actors of a business ecosystem that It is defined on several levels and based on learning and interaction between them. Based on the dimension of change, the main components that can be called co-evolutionary changes between different actors are "simultaneity and stability of changes" in which both actors must change simultaneously and mutually and the changes created in both entities must be stable (reproducible) and permanent. In the characteristics of ecosystem actors, the internal characteristics of each actor including "having intelligent, learning and interactive strategies" can have an effect on co-evolution, and the characteristics of the focal company of the ecosystem include intelligence, planning, and value. Development along with the laws and norms that are included in the governance structure of the ecosystem can have an effect on the formation of co-evolution at this level.
Conclusion
In this research, the study and analysis of co-evolutionary studies in the business ecosystem has been done using systematic review methods and content analysis of selected researches in this field. The review of the literature shows how over the years, the studies related to co-evolution in terms of conceptual and applied researches have adopted the analytical orientations of heterogeneity and still there is no unified understanding of this concept. Not in studies. The multiplicity of features and requirements mentioned in different sources and the observation that different studies have only considered some of these requirements have made the researchers in this field confused in obtaining a unified understanding of this approach and how it works. On the other hand, specific analyzes about where this point of view is now and where it can move to, are still not visible in the literature of organization and management. The aim of this research is to get an image of the past research process and future research streams and to know what and how the concept of co-evolution in the business ecosystem is, which is done through a systematic review and analysis of the content of highly cited articles. This field has answered two research questions. Each of the identified dimensions of this research can be used in companies that interact in cooperation networks and business ecosystems. The boundaries of the industry are gradually disappearing and different types of symbiosis, including ecosystems, replace the industry, the issue of co-evolution especially between the leaders and other members of the ecosystems. , co-evolution in technological entrepreneurship ecosystems in dynamic environments, the way of network formation in institutional ecosystems and the co-evolutionary leadership model in entrepreneurship and innovation ecosystems can be among future theoretical researches.