As soon as try to use plain UML for representation of real-world systems you will hit a wall trying to represent values across complex hierarchical systems; the context-specific values capability of SysML removes that wall, so you can reach deep inside a system and change configuration of parts and set values anywhere you desire!
The following tutorial trail section is a prerequisite for this section: 08:02: The SysML ValueType, Unit, and using values
In particular, please make sure you fully understand:
This very important and challenging model-based system engineering topic is covered in full in the following Webel IT Australia course using live demonstration with props as a training aid:
Please email or phone Webel IT Australia on +61 405 029 008 to arrange On-Site, Off-Site, or Live Online remote web training seminars and workshops.