Book excerpt: In recent years the importance of Signals Intelligence (Sigint) has become more prominent, especially the capabilities and possibilities of reading and deciphering diplomatic, military and commercial communications of other nations. This growing awareness of the importance of intelligence applies not only to the activities of the big services but also to those smaller nations like The Netherlands. For this reason The Netherlands Intelligence Association (NISA) was recently established in which academics and (former and still active) members of The Netherlands intelligence community work together in order to promote research into the history of Dutch intelligence communities.--