A "thin theory of the good," and not a "thick theory," is used to "explicate the notion of (*) rationality" possessed by the "mutually disinterested agents" of this thought experiment, which concerns people who match their "conjectured principles" and "considered judgments" of fairness through a process called "reflective equilibrium".
In an essay named for this thought experiment, Ronald Dworkin analogizes it to a poker game played in which it is found that the "deck is one card short" in the "middle of a hand."  The original formulation of this thought experiment concerns "imagined deliberators" who are not motivated by "psychological propensities" but might be affected by "excusable general envy." A "thin theory of the good," and not a "thick theory," is used to "explicate the notion of (*) rationality" possessed by the "mutually disinterested agents" of this thought experiment, which concerns people who match their "conjectured principles" and "considered judgments" of fairness through a process called "reflective equilibrium". Decisions are made from beyond a "veil of ignorance" in, for 10 points, what thought experiment in John Rawls' A Theory of Justice?
In an essay named for this thought experiment, Ronald Dworkin analogizes it to a poker game played in which it is found that the "deck is one card short" in the "middle of a hand."  
original position [prompt on veil of ignorance]