Efficient adaptation aims at ensuring that a user interface is adapted to a user’s task according to the context of use, since the end user is carrying out a task with one or several computing platforms in a physical environment. This tutorial presents key concepts of adaptation: principles that guide it, relevant context information and how to consider it, dimensions and abstraction levels subject to adaptation, as well as, languages, methods and techniques used in this domain. This tutorial aims at teaching major aspects to be considered for adaptation of user interfaces in general and concerning the context of use in particular, including the end user (or several of them, as in multi-user interfaces), the platform (or several of them, as in multi-device environments), and the physical environment (or several of them, as in multi-location systems).