 A model of changes in preferences can be obtained by replacing the standard AGM language by sentences of the form \(p \ge q\) (“\(p\) is at least as good as \(q\)”) and their truth-functional combinations. The adoption of a new preference can then take the form of revision by such a preference sentence. Partial meet contraction can be used, but some modifications of the AGM model seem to be necessary in applications to preferences (Hansson 1995, Lang and van der Torre 2008, Grüne-Yanoff and Hansson 2009).