Hi, there are thousands of firms in the world. Some of them are predominant firms such as samsung, sony and apple. There are thousands of working people in these firms. I would like to understand that how these firms keep the information collected. When they learn a new information, do they write it on a note book and when required they open the notebook or their engineers keep that information in their minds and when required they bring it back by remembering? Do they draw important parts of (academic) books in which information is contained? How these processes happen?