from e-learning to ubiquitous learning; theoretical principles

because of approaches to learning in every place and at any time, ubiquitous learning with knowledge of the context and framework, and due to the development of wireless technologies and sensors, the learning process has changed. mobile learning and ubiquitous learning as models of e-learning that refer to the acquisition of knowledge, attitudes and skills through wireless technologies. the effectiveness of e-learning and its new methods including mobile learning and ubiquitous learning are in need of attention to the approaches and theories of e-learning, because by employing e-learning methods, we can find solutions for teaching and learning that would meet the needs of today's education and training. in recent years, e-learning researchers have found that the development of wireless communications and sensor technology has changed the research issues of e-learning to mobile learning and then, it has changed mobile learning to ubiquitous learning.