Managing Change in an OTS-Aware Requirements Engineering Approach Kendra Cooper Lawrence Chung [e-mail] [e-mail] Department of Computer Science The University of Texas at Dallas

1
Managing Change in an OTS-Aware
Requirements Engineering ApproachKendra Cooper
Lawrence Chung kcooper_at_utdallas.edu
chung_at_utdallas.eduDepartment of
Computer Science The University of Texas at
Dallas
2
A Simple Scenario In Digital Library System

• Current DLS
• MPEG-3 (implementation using a Java Media
  Framework feature)
• Operating Manual "Watch out for the change in
  multimedia trend"
• Trend increase in the use of MPEG-4
• Question should there be any change, and if so
  what, and how?
• Searching begins mostly using Internet, for
  something that's good...
• Along the way decide on an IBM plug-in,
• replacement, done.
• Wait a minute
• - Isn't searching too time-consuming?
• - How "good" is this IBM plug-in?
• - Is the change complete?

3
Wait a minute

• Isn't searching too time-consuming?
• the current system also involved searching
  time-consuming, labor-intensive
• Build a repository of components and options
• - there was a consideration of some other
  options too
• - History indeed is repeating itself!
• Represent the historical record
• How "good" is this IBM plug-in?
• Yes/No, depending on what good means
• Model the good-ness
• Is the change complete?
• No, it has implications, and has impacts
• Establish traceability in the historical record
  for impact analysis, within across

4
Representing Components and options, Historical
Record, Model Good-ness,Establish Traceability
in Knowledge-Based Repository.
SIG Good DLS lt- Easy to Use Interface,
MPEG-4 denied claim high cost, low priority

Domains security, persistent storage,
Components multimedia - JMF, SIG
Support Multimedia Standards lt- Image
Standards, MPEG-4 not in JMF, but in
IBM Toolkit
5
(Re)-Evaluating Development Decisions for a
Component Based DLS
Change priority of MPEG-4, from low to very high
(!!)
Reexamine components JMF IBM Tookit no
change
IBM Toolkit now part of CBA
Claim MPEG-4 no longer rejected
Complies With Current Standards now better
satisficed
Claim Periodic checking no longer needed
6
The CAT

• A reference framework
• Repository with reference applications
• Digital Library System
• Home Appliance Control System
• Tool Support
• Defining models (involving UML diagrams)
• Knowledge-Based Repository
• Searching and ranking (CBR/AHP/Fuzzy/NFR-QR)

7
The CAT Knowledge-Based RepositoryExtending OMG
Standards to Support Modeling Agents, Goals, and
Components Metamodel Version 1.0
8
The CAT Knowledge-Based Repository
9
Road Ahead

• Classification schemes
• Types of sources of change
• Types of change propagation
• Further Applications/Case studies
• Model of Change