While "ubiquitous learning" is a growing research area, aspects of adaptivity and personalization become more and more important. Incorporating adaptivity and personalization issues in ubiquitous learning systems (ULS) allows these systems to provide learners with an environment that is not only accessible anytime and anywhere,but also accommodating to the individual preferences and needs of learners.Being aware of and considering the current context of the learners as well as, for example, their different prior knowledge, interests, learning styles, learning goals, and so on, leads to a more effective, convenient, and successful learning experience in the ubiquitous learning environments.