This book develops a rigorous and integrative framework for understanding complex systems, strategy, and dynamic equilibrium in high-velocity environments. Moving beyond reductionist tools and static models, it advances a systems-theoretical perspective in which structure, dynamics, and agency are inseparably intertwined. At its core, the work introduces a triadic architectural logic as a minimal condition for analysing systemic coherence. Drawing on General Systems Theory, dynamic systems theory, and epistemological reflection, it demonstrates that viable systems cannot be understood through linear causality or isolated variables, but only through recursive interactions across multiple layers of abstraction. The book offers a set of conceptual and analytical instruments-including the Strategic Viability Framework and the Calibration Tool-that enable the diagnosis and navigation of complex, evolving environments. These are complemented by formalised representations of systemic dynamics, highlighting the increasing relevance of temporal compression, non-linearity, and interdependence. Rather than simplifying complexity, this work deliberately preserves its structural richness. It is addressed to readers seeking a deeper understanding of systemic logic-across disciplines such as systems science, strategy, organisational theory, and applied complexity research.