  When consequentialists incorporate a variety of values, they need to rank or weigh each value against the others. This is often difficult. Some consequentialists even hold that certain values are incommensurable or incomparable in that no comparison of their values is possible (Griffin 1986 and Chang 1997). This position allows consequentialists to recognize the possibility of irresolvable moral dilemmas (Sinnott-Armstrong 1988, 81; Railton 2003, 249–91).