A perennially relevant question is making the rounds again in the wake of the Arab Spring: Why can't anyone predict revolutions? (See Sina's "quote of the week," for example.) The issue is again raised in this piece by Foreign Policy managing editor Blake Hounshell, in conjunction with Foreign Policy's seventh annual publication of its Failed States Index (FSI).
The article seems geared toward explaining why the FSI didn't "predict" the Arab Spring, and it discusses the fact that indices are generally better at providing snapshots rather than acting as crystal balls. It also notes that while the FSI has captured some elements of political destabilization in the Middle East, it has missed others. Experts quoted in the article note that revolutions may be inherently difficult to predict, due to the so-called "demonstration effect" (whereby revolutions, aided by satellite television and other advances in communication technology, allegedly spread by contagion) and other factors.