Thinking of Business Processes Systematically.- From Language Acquisition to Subject-oriented Modeling.- The Integrated S-BPM Process Model.- Subject-oriented Process Analysis.- Modeling Processes in a Subject-Oriented Way.- Subject-Oriented Modeling by Construction and Restriction.- Subject-oriented Validation of Processes and Process Models.- Subject-oriented Optimization of Processes.- Organization-specific Implementation of Subject-oriented Processes.- IT-Implementation of Subject-Oriented Business Processes.- Subject-oriented Monitoring of Processes.- A Precise Description of the S-BPM Modeling Method.- Tools for S-BPM.- S-BPM Method by Comparison.- Conclusion.- A Subject-Oriented Interpreter Model for S-BPM.