Summary: This white paper describes an electronic patient-reported outcomes (ePRO) modality decision tool that provides a systematic, standardized framework for assessing the utility and feasibility of the two main electronic patient-reported outcomes modalities: handheld device and interactive voice response (IVR) systems. The components of this tool are based on published and unpublished research as well as the substantial experience of two ePRO market leaders and have been further validated by market research with clinical trial sponsors.