Abstract 1. Introduction 2. Dialect variation on syllable-initial /h/-deletion 3. /h/-deletion and /h/-insertion in Type C dialects 4. Paradox of /h/-deletion and /h/-insertion 5. A proposal: a lexicon-dependent OT account 5.1. Issues on underlying representation 5.2. A lexicon-dependent OT Account 5.3. A possible lexicon-dependent derivational account 5.4. Underlying representation, Richness of the Base, and Lexicon Optimization 6. Conclusion References