by 
The open-access book Modellieren und Programmieren unter Verwendung der Satzstruktur natürlicher Sprachen provides an intuitive and practice-oriented introduction to subject-oriented modeling and programming. Using the sentence structure of natural language as a foundation, it explains step by step how processes and systems can be modeled, specified, and implemented.
The book introduces the core modeling elements of the subject-oriented paradigm together with practical implementation techniques, making it suitable both for beginners and for practitioners interested in communication-oriented system development and executable process models.
