Best practices for designing Experience Sampling Method (ESM) & Ecological Momentary Assessment (EMA) Studies for Smartphones Devices. ESM & EMA fit nicely into the realm of mobile and smartphone research. The ubiquity of these devices means that participants can be prompted in-the-moment, and not after the experience has passed. MetricWire is the world’s most advanced data collection and analysis platform for smartphone research. We offer smartphone technology for Experience Sampling and Ecological Momentary Assessment that cannot be matched. To learn more about our technology check out our website: https://metricwire.com/