Suppose we start from the premise that a system process is a unit determined by and connected with the quality of relations between certain elements. In that case, we can select and study a specific subsystem as a partial structure of social activity, with the subsystem having all attributes of a structural unity in crisis. If these requirements are met, a general social system model to be implemented in studied subsystems' crisis management situations can be designed. The paper defines a decision-making model and its response to perturbation, which causes a crisis in two components of social activity. One component is public administration, which is defined by its activities, especially during a crisis. To ensure a social activity's primary function's unique functioning, public administration is a highly complex system whose main issue is its internal structure or hierarchy. Described complexity can be a function of horizontal complexity, with a hierarchical component frequently being lost. On the other hand, it can be a result of a vertical component during crisis management. Another social activity domain is information as a particular segment that is important for society's response during a crisis. As an internal social structure, information seam stable, i.e., its primary function is not disrupted during crisis management; however, internal information structure is profoundly disrupted due to delays. Some aspects of information connections, especially internal connections, are disrupted due to the lack of solid and fast enough responses to a crisis. In crisis changes, prompt responses adjusted to new social situations are of the utmost importance. This paper's designed model demonstrates the implementation of disruptions, which are consequences of fast adjustments to contemporary social events.