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This paper places mobile learning in the space of the existing learning methods. The three main groups of challenges -technological, development and pedagogical -in the transition from e-learning to m-learning are defined. The influence they make over the main participants in the m-learning process -developers, educators and students is also examined.

This paper describes a methodology for mobile devices characteristics recognition. The proposed main stages are: analysis, selection, program realisation, implementation and evaluation. The basic activities for each stage are determined. The methods which can be used for mobile device recognition are examined. The proposed methodology is used successfully during the development of a system for mobile foreign language learning.

The paper presents an investigation of the user's text reading speed on mobile devices. For this purpose specialised software was developed and used. A comparison with the text reading speeds when is used a paper, personal computer and mobile device screen is made. The obtained results are compared with those of similar investigations. The appropriate conclusions are made. INTRODUCTIONThe development of mobile and wireless communication technologies leads to increasingly widespread use of mobile devices in everyday life not only for voice services but also for obtaining additional information.Still the main medium of information remains the text, although very quickly mobile audio and video services are developed. At the same time mobile devices have a number of limitation factors during the visualization of the text -a smaller screen and lower resolution than the screens of PCs and also their navigation is more complicated. These factors significantly affect the reading speed.There are several research studies on the impact of various factors on the speed of reading (users age [2], font size [8], media type [6], text orientation [10] or method for text presentation [1,4,5,7,9]), mainly for texts in English and Chinese.The review of available literature shows that up to now there are no studies regarding the reading speed of Bulgarian text on the mobile device screen and they are not compared with the reading speed on paper and on computer screen. This paper describes one study conducted at the University of Ruse.