The following image highlights the primary strengths and limitations of four modes that are used in the in-depth interview (IDI) method — face-to-face (either in-person or online), phone, email, and mobile (when conducting in-the-moment research, e.g., when using a product or experiencing an event). A complete discussion concerning these modes in the IDI method can be found on pages 57-70 in Applied Qualitative Design: A Total Quality Framework Approach (Roller & Lavrakas, 2015). [Note: Click image to enlarge]