The proliferation of evidence-based guidance requires a greater focus on implementation. Theory is needed to explain complex processes across the multiple organizational levels of health care. This social context of health involves the interaction between professionals, patients, and organizational systems in the delivery of care. Current applications of complexity theory in global and public health. According to Pearce and Merletti, applying this emerging worldview to public health can lead to a more comprehensive analysis of public health challenges. For example, asking questions beyond specific health phenomena from a biomedical perspective, e.g. a summary. The way complexity is typically interpreted in the healthcare literature misses the point of complexity theory, thanks to a series of influential but misleading BMJ articles. Complexity provides an explanation of patterns and structures in certain systems by modeling globally known outcomes. “Complexity,” as a distinct domain of thought and practice, owes its coherence to contributions from the fields of systems science, cybernetics, sociology, philosophy, and artificial intelligence Castellani and through which began a formal program of interdisciplinary research. Its popularization owes a significant debt to its largest, The global prevalence and disease burden of obesity continues to increase in the United States and, 2, poses a major threat to public health and quality of life . Variation in body mass. “Complexity theory has gradually entered the lexicon of health sciences. » Favor 36, p. 873 indicated that "a new way of thinking about systems has gained prominence" in the. If used correctly, complexity theory offers a potentially useful perspective for conceptualizing and solving health problems. Therefore, we identified an evidence gap regarding how complexity theory has been applied to health and social care research, which warranted further review and synthesis of the evidence. Context: The health system has proven to be a challenging environment for innovation, particularly in the area of ​​health services management and research. This is often attributed to the complexity of the health sector, characterized by intersecting biological, social and political systems spread across disparate geographies. Complexity, leadership and management in healthcare organizations. Current managerial thinking is based on the principle that a well-functioning organization is like a well-oiled machine. suggests that performance is optimized when work is specified in detail and distributed among distinct operational units. often oppose it. Complexity theory, science, and thinking, as they develop and are properly used, will help clinicians and health scientists address some of their most intractable challenges in daily practice, from difficulties which never were and cannot be, by their own means. nature, understood and treated through simplistic linear thinking, this social context of health involves the interaction between professionals, patients and organizational systems in the delivery of care. Complexity theory can provide an explanatory framework to explain the complexities inherent in implementation in contexts