The typical application development design paradigm is "request and response." Firms design apps to get input, process requests, and then respond. That approach is insufficient for IoT applications because internet of things (IoT) applications must be ready to receive and learn from streaming data from myriad devices all of the time. Think of a spigot that is always open. So application development and delivery (AD&D) pros need to understand the new principles and paradigms of IoT applications.