IT outsourcing has got a high priority in science and practice. Scientifically is also Cloud Computing as a partial-and full IT outsourcing approach discussed. Technological and market-related developments in scientific research and economic reality provide the motivation to process the state-of-the-art and future considerations of IT outsourcing in a literature review. Overall, from 2000 to 2012, 179 articles could be identified and analyzed by a systematic literature review. A systematic classification of research in IT outsourcing helps to classify the wide range of topics in this area. Thematic developments, subject areas, research theories and industry sectors are analyzed in a systematic manner.