"Most of the world's problems today are either caused or exacerbated by the inability of our political and corporate leaders to think systemically - in terms of relationships, patterns, and context. Debora Hammond's well-written account of the history of systems thinking in the social sciences brings much-needed clarification to a chapter of twentieth-century intellectual history that is surprisingly little known. The issues discussed by the author are highly relevant to human well-being in our globally interconnected world."—Fritjof Capra, author of The Web of Life and The Hidden Connections