Like any technology, there are certain cases in which speech technology pro vides clear benefits over other modalities and other cases in which speech may not be the appropriate choice. The cases where speech is, and is not, a good fit have historically been poorly and incompletely defined. This session presents the results of a workshop conducted by the Association for Voice Interaction Design (AVIxD) that aims to correct this problem by rigorously and comprehensively defining the contexts in which the use of speech technolo gies makes sense.