The chapter on model theory in the *Beginning Mathematical Logic* Study Guide was last updated quite recently, in particular to take account of Roman Kossak’s nice 20221 book *Model Theory for Beginners* (College Publications). Rather little has changed, then, in this current revision, except some minor tidying (though I have dropped as unnecessary a previously footnoted long proof). But still, here it is, the revised Chapter 5 (as it is now numbered).