GIS does a better job of sharing data and information than knowledge, which is more difficult to detach from the knower.

With a collection of tools, GIS is able to bridge the gap between curiosity-driven science and practical problem-solving.

GIS solves the ancient problem of combining general scientific knowledge with specific information, and gives practical value to both.

The five Ms of GIS application are mapping, measurement, monitoring, modeling and management.

The key GIS representation issues are what to represent and how to represent it.

Effective spatial analysis require an intelligent user, not just a powerful computer.

Internet GIS have the highest number of users.

(Source: Longley P. A., Goodchild M. F., Maguire D. J. and Rhind D. W., 2005, Geographic Information Systems and Science, Second Edition, John Wiley and Sons Ltd., England)