It was quite a surprise when Kurt Sandkuhl and Matthias Wißotzki checked the download figures for the enterprise modeling books on Springerlink. The German language version in total showed more than 20.000 downloads for the book and individual chapters. The English version already has 17.000 although it is only 18 months old. It is really cool that so many people are interested in the material about enterprise modeling and the 4EM approach.
German book version: http://link.springer.com/book/10.1007/978-3-642-31093-5
English book version: link.springer.com/book/10.1007/978-3-662-43725-4