One of the open questions in the field of interaction design is "what inputs or interaction techniques should be used with augmented reality devices?" The transition from a touchpad and a keyboard to a multi-touch device was relatively small. The transition from a multi-touch device to an HMD with no controllers or clear surface to interact with is more complicated. This book is a guide for how to figure out what interaction techniques and modalities people prefer when interacting with those devices. The name of the technique covered here is Elicitation. Elicitation is a form of participatory design, meaning design with direct end-user involvement. By running an elicitation study researchers can observe unconstrained human interactions with emerging technologies to help guide input design.