This article describes a method for choosing of interaction peripherals for wearable computer in Mobile and Augmented Reality context. This method is based on a transformational process starting by user tasks modeling and their decomposition on user, machine and interaction tasks. Interaction tasks are expressed by interaction atoms (device independent) which are realized by interaction techniques related to interaction devices. A referential of interaction devices helps designers in choosing devices in relation with tasks to be supported and contextual requirements (functional and non-functional). A well organized selection process based on several devices/criteria matrixes allows explicit comparison of configurations in regard with usability criteria.