So, what is happening is that although we have lots of data available at cheap prices - for example also through the Internet - we are not being informed by that data. For example, I can easily have a database including every citizen in my nation, the list of all citizens in my nation and I can have this database in my PC, the hard disk allows it, but if I am interested in answering questions such as "What is the state where a given surname is more common?" or "Is this surname completely absent from some states?" or "Are there some people with this surname in the West"? I have either to browse through pages and pages of names and trying to manually draw some point on a map, or I have to come up with a computer program that draws the data, and when I have this program, so when I am able to get in one second or less the map of the nation and some points drawn here and there corresponding to the location of the surname I am interested in, then my lots of data suddenly turn into easily perceivable information, and I can take a look at this map and answer the three questions I mentioned before in a couple of seconds. And finally there is another reason why IV is becoming a hot topic and the reason is that some graphic boards available for today's PCs have the power of the Silicon graphics workstation of five years ago. So, building complex IV applications is now commercially possible. There is a commercial interest towards the field.