1.4 Book Context
22 CHAPTER 1 Introduction
1.4.9 Specifi cation and Description Language
The Specification and Description Language ( SDL ) was developed in the telecommunication
industry [36]. It is published as a standard by the International
Telecommunication Union ( ITU ). Meanwhile SDL is used outside the telecommunication
industry, e.g., to develop medical systems, or in the aviation and space domain.
The SDL is a language that has many common features with UML and thus
SysML. For example, the sequence diagrams stem from the Message Sequence
Charts ( MSC ) of SDL [37]. The large number of common features supports the
mapping of SDL models to SysML/UML models [43].
1.4.10 V-Model XT
The V-Model is an approach model that was developed by commissioning of the
State of Germany for planning and implementing system development projects. It
considers the entire lifecycle of a system nicely fitting the line of thinking in systems
engineering.
The current V-Model XT from 2004 is based on V-Model 97, its predecessor.
The model ??™ s revision was motivated when, after 7 years, the old V-Model was
found to no longer comply with the current state of the art in projects.
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