Classicists and connectionists alike claim to be able to explain syste
maticity. The proposed classicist explanation, I argue, is little more
than a promissory note, one that classicists have no idea how to rede
em. Smolensky's (1995) proposed connectionist explanation fares little
better: it is not vulnerable to recent classicist objections, but it
nonetheless fails, particularly if one requires, as some classicists d
o, that explanations of systematicity take the form of a 'functional a
nalysis'. Nonetheless, there are, I argue, reasons for cautious optimi
sm about the prospects of a connectionist explanation.