This document defines a system as a collection of interrelated parts that work together to achieve an overall goal. It states that libraries are complex systems with inputs, processes, outputs, and feedback. Libraries receive resources as input, organize and classify information, and output resources back into their environment. As systems, libraries must adapt to changes in their environments and accept feedback to survive. The document uses academic libraries as an example, noting they consist of subsystems and interact with higher education and external economic, political, and cultural systems. It emphasizes that libraries must continuously change and adapt to meet rising information needs, technology changes, and shifts in external social, political, and economic systems.