eVSM Blog
Value stream mapping is a process that should be done as a team. You can't get a realistic sense of how a value stream works without involving the people who work in that value stream. The de-facto standard way of making value stream maps is by having a group of people work together to form a consensus on how things actually work, and make that into a map.
So once your team have come up with a value stream map (on post-it notes, whiteboard, butcher paper, wherever..) it typically helps to store your map electronically. The simplest reason is to make the map available and easier to find than if it remains strictly on paper.