In the years following her role as the lead author of the international bestseller, Limits to Growth--the first book to show the consequences of unchecked growth on a finite planet  Donella Meadows remained a pioneer of environmental and social analysis until her untimely death in 2001. Meadows' newly released manuscript, Thinking in Systems, is a concise and crucial book offering insight for problem solving on scales ranging from the personal to the global. Edited by the Sustainability Institute's Diana Wright, this essential primer brings systems thinking out of the realm of computers and equations and into the tangible world, showing readers how to develop the systems-thinking skills that thought leaders across the globe consider critical for 21st-century life.