Abstract. In Optimality Theory, an important tool for accounting for morpho-phonological processes is output-output correspondence. A development of this approach is Transderivational Anti-Faithfulness (TAF), constituting a reversal of faithfulness. This article will explore the nature of TAF, in order to test this approach as an extension of Optimality Theory. The example of morphologically triggered accent in Modern Greek will turn out to reveal some formal problems of TAF.1 1