The literature review is considered to be the most difficult chapter to write a dissertation. This is due both to the objective difficulty is the need to search, analysis and processing a large volume of literature, and the fact that usually a literature review is the breakdown of the pen, and that while it was running post-graduate study to competently execute their thoughts. On the other hand, is often a literature review - the first requirements of the thesis supervisor, and that on the basis of it he will make an opinion about ...