Reliable spelling despite poor spoken letter recognition

Speech is a powerful, flexible, and familiar interaction modality -after all, conversation is the medium of choice in human relations. Although speech recognizers promise to bring this rich, expressive channel to human-computer interaction, spoken language systems will never succeed commercially unless they compensate for imperfect recognition. Given the choice between a difficult-to-learn interface that works and one that is intuitive but unreliable, users will opt for the former.