The problem for IP decision making, in short, is that your credal committee can disagree on what the best course of action is, and when they do, it is unclear how you should act (recall the definitions in section 1.1). Imagine betting on a coin of unknown bias. Consider the indicator gambles on heads and tails. Both bets have imprecise expectation \([0,1]\). How are you supposed to compare these expectations? The bets are incomparable. (If the coin case appears to have too much exploitable symmetry, consider unit bets on Elga pulling toothpaste or jellyfish from his bag.) This incomparability, argues Williamson, leads to decision making paralysis, and this highlights a flaw in the epistemology (2010: 70). This argument seems to be missing the point, however, if one of our motivations for IP is precisely to be able to represent such incompatibility of prospects (see section 2.2)! The incommensurability of options entailed by IP is not a bug, it’s a feature. Decision making with imprecise probabilities is discussed by Seidenfeld (2004), Troffaes (2007), Seidenfeld, Schervish, and Kadane (2010), Bradley (2015), Williams (2014), Huntley, Hable, and Troffaes (2014).