[...] inflectional rules are separable from derivation, in that the latter apply to form lexical items, while the former apply to convert these into surface inflected words.
- Anderson (2004), Pag. 32

A question that immediately arises is whether there is any point to distinguish inflection (the morphology that involves interaction with the syntax) from derivation (the morphology that does not).
- Anderson (2004), Pag. 30