Knowledge management and preservation started thousands of years ago from cave paintings, representing words by pictures, later moving to books through the invention of paper and printing in the 15 th century (Wallace, 2007). Later with the development of computing systems, knowledge/information was stored in the form of computing documents. In the first decade of the 21 st century there was an explosion of volume, velocity, and variety (3V) of data. In addition to the storage cost, extraction of information/knowledge was non-trivial and thus required the evolution of knowledge management tools. In the 2 nd