About the Author: Dr. Serge Zacher is retired university professor of automation and author of many patents, papers and books, including „Regelungstechnik für Ingenieure“ (with M. Reuter), which counts to standard works for German universities of applied sciences. His further books in the Springer-Vieweg are „Automatisierungstechnik kompakt“, „Übungsbuch Regelungstechnik“, „Drei-Bode-Plots-Verfahren“ and “Regelungstechnik mit Data Stream Management”. He is actually a lecturer of automation at the universities of applied sciences Darmstadt and Stuttgart.