According to Parisi (2013), there are many possible deÀ nitions of a complex system or phenomenon. A complex system is one whose behavior crucially depends on the details of the system itself. This dependence is often very difÀ cult to understand. In other words, system behavior (e.g., the COVID-19 pandemic) can be extremely sensitive to details leading to large variations in the behavior of the system itself. The model for evaluating complex phenomena, such as the COVID-19 pandemic, is based on several assumptions: 1. COVID-19 is a complex phenomenon like all natural phenomena: biological, sociological, economic, political and all others because by their nature they are complex. 2. We evaluate not only the facts but also the agents who produce the facts. 3. We consider the evaluation process as an intertwining of the complex and the complicated. Conceptually, complex and complicated, layman-like words have different meanings here. The COVID-19 pandemic is a model that can be considered a mixed model in the sense that we resonate in two ways, qualitatively and quantitatively. Finally, evaluation is a dialogical model. The dialogue model does not criticize but educates agents for better future interventions and evaluations of those interventions.