The concepts you provide in the literature search will later allow the reader to understand a little more specifically what you are doing. Summarize the major influences that motivate the current study. Remember, you should be looking from the shoulders of giants. If your library search only uncovered midgets, search again. If it turns out there really is little or only weak articles in your chosen area, you can go a little multi-disciplinary and get some articles from a related field.
Major influences deserve a paragraph.
More minor influences should be summarized in a sentence or two. Try to just give the major result and include the reference. Organize your literature search in some logical way, such as from more theoretical to more applied and close to your study. Chronological is another possible approach. Literature may range approximately from about two to four pages depending on a number of factors.