Marcia Rock is one of the preeminent researchers on bug-in-ear coaching. In this method, an instructional coach watches a live video feed of a teacher's classroom and provides in-the-moment feedback via a wireless earpiece. The process, which is sometimes compared to a football coach communicating with a quarterback, is become increasingly feasible and popular thanks to ubiquitous videoconferencing and mobile technology. Rock spoke with "The Learning Professional" to share insights and advice based on her research.