『Thinking in Systems』要約

Donella H. Meadows’ *Thinking in Systems* is a concise primer on systems thinking, published posthumously in 2008 and assembled from a manuscript she had been developing for years. Meadows, a lead author of *The Limits to Growth* and a longtime MIT researcher, argues that many economic, ecological, and social problems arise not from bad actors but from the structure of the systems in which people operate. The book’s core framework separates a system into three parts: elements, interconnections, and purpose. Meadows shows how the same elements can produce different behavior when their connections or goals change, using examples such as a slinky, a thermostat, and a fishing economy. She introduces stocks and flows as the basic accounting of any system, distinguishing renewable and nonrenewable stocks, and explains how delays between action and feedback often mislead decision-makers. A central section catalogs system traps, or archetypes, including policy resistance, the tragedy of the commons, drift to low performance, escalation, success to the successful, and shifting the burden to the intervener. Meadows pairs each with strategies for escaping it. She then ranks leverage points for intervening in a system, from weak ones like changing parameters and subsidies to powerful ones like changing information flows, rules, goals, and paradigms. Meadows closes by urging humility: complex systems cannot be predicted or controlled, only watched, adapted to, and nudged. She stresses dancing with systems rather than conquering them. The book is widely taught in economics, management, and sustainability courses as an accessible introduction to feedback, resilience, self-organization, and hierarchy.