 The system's theory is the Interdisciplinary Study of Systems. The system is a cohesive conglomeration of interrelated and interdependent parts that is either natural or man-made. Every system is delineated by its spatial and temporal boundaries, surrounded and influenced by its environment, described by its structure and purpose or nature and express in its functioning. In terms of its effects, the system can be more than the sum of its parts if it expresses synergy or emergent behavior. Changing one part of the system usually affects other parts and the whole system, with predictable patterns of behavior. For systems that are self-learning and self-adapting, the positive growth and adaptation depend upon how well the system is adjusted with its environment. Some systems function mainly to support other systems by aiding in the maintenance of the other system to prevent failure. The goal of systems theory is systematically discovering the system's dynamics, constraints, conditions and elucidating principles purpose, measure, methods, tools, etc. that can be discerned and applied to systems that have level of nesting, and in every field for achieving optimized equiptionality. General systems theory is about broadly applicable concepts and principles, as opposed to concepts and principles applicable to one domain of knowledge. It distinguishes dynamic or active systems from static or passive systems. Active systems are activity structures or components that interact in behaviors and processes. Active systems are structures and components that are being processed. E.g. a program is passive when it is a disk file and active when it runs in memory. The field is related to systems think and hand systems engineering.