Guide to SysML, Third Edition: The Systems Modeling Language by Sanford Friedenthal et al.. Rhapsody® is a trademark of International Business Machines Corporation ("IBM"). Limitations Requirements Engineering - This book is not an exhaustive text on requirements engineering. However, the "Further Reading" appendix does list a number of excellent books for deeper understanding of this topic. Tool Version - The first edition of this book was authored using IBM Engineering Systems Design Rhapsody version 9.01. Future versions of Rhapsody may have significant changes to the user interface. Tool Manual - This is a beginner's introduction and is not a comprehensive reference for every feature of the tool. Screen Captures - Most readers appreciate our approach of providing annotated screen captures of the actual tool. However, there are physical technology issues that limit the level of sharpness we can achieve in this format. A small number of readers of previous books in this series have expressed frustration on this point.