 Chang (2002a,b) proposes a similar strategy, but she takes value facts to be basic, and defines the betterness relation—plus a new “parity” relation we will denote “\(\parallel\)”—from them, instead of the reverse. In addition, she defines these relations in terms of the evaluative differences between \(A\) and \(B,\) i.e., \((A - B)\) is the set of all licensed differences in value between \(A\) and \(B.\) If \((A - B) = \varnothing,\) then \(A\) and \(B\) are incomparable; however, if \((A - B) \ne \varnothing,\) the relevant relations are: