<P>Originally published in 1967, the modest and plainly descriptive title of <I>Development Projects Observed</I> is deceptive. Today, it is recognized as the ultimate volume of Hirschman's groundbreaking trilogy on development, and as the bridge to the broader social science themes of his subsequent writings. Though among his lesser-known works, this unassuming tome is one of his most influential.</P><P>It is in this book that Hirschman first shared his now famous "Principle of the Hiding Hand." In an April 2013 <I>New Yorker</I> issue, Malcolm Gladwell wrote an appreciation of the principle, described by Cass Sunstein in the book's new foreword as "a bit of a trick up history's sleeve." It can be summed up as a phenomenon in which people's inability to foresee obstacles leads to actions that succeed because people have far more problem-solving ability that they anticipate or appreciate.</P><P>And it is in <I>Development Projects Observed</I> that Hirschman laid the foundation for the core of his most important work, <I>Exit, Voice, and Loyalty</I>, and later led to the concept of an "exit strategy."</P>