Computer World. Матросова Т.А. - 44 стр.

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43
when customer service representatives tell you that they can't do something obviously
reasonable, you can count on its being the software.
TEXT 5
Read the text and speak about the reason for transforming SDL into UML.
This document describes an automatable approach for transforming system
specifications expressed in the ITU( International Telecommunication Union)
language SDL [Specification and Description Language] to the industry standard
object-oriented Unified Modeling Language (UML) .
The purpose behind such a translation is to take advantage of formalized system
specifications expressed in the SDL language. SDL is used mostly in the telecom
domain for specifying communication protocols. While several SDL-oriented tools
exist in the market, there are some signif icant advantages to doing software
development with UML. Although SDL has been around significantly longer than the
UML, the UML has penetrated the software community much more rapidly and more
extensively than SDL. This is because it has a broader scope and because it has been
marketed more successfully. Consequently, there is a much broader base of expertise
for UML than there is for SDL 1 , even in these early days of UML. This rapid
penetration is accompanied by a corresponding growth in tool support, with the
number and variety of UML-oriented tools far exceeding SDL tools. Finally, in
contrast to the relative rigidity of SDL – which stems from its roots as a specification
language (as opposed to an implementation language) – UML generally has far
greater expressive power and versatility for representing the diversity of techniques
used in industrial software development.
TEXT 6
Read the text. What types of diagrams are mentioned in the text? What can
these diagrams do?
The Sequence Diagram is one of the most interesting and useful diagrams in the
Unified Modeling Language (UML). It helps you document and understand the
dynamic aspects of your software system–specifically the sequence of messages that
are sent and received between objects. Sequence diagrams can help you comprehend
and solve difficult issues in the process-intensive portions of your applications.
Fast Facts
The Sequence Diagram is one of the five UML diagrams that help you model
the dynamic aspects of your software. Sequence diagrams and their cousin,
collaboration diagrams, show the dynamic interaction between objects in the system.
A sequence diagram's focus is the time ordering of messages between objects
(usually business objects).
This article covers one of the most interesting diagrams in the UML–the
sequence diagram. They are most often used in the construction phase of software
projects and are especially useful when analyzing the process-intensive portions of

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