page 1 11/6/2005 A Change Model in a SCM Tool Author: IvicaCrnkovic ABB Industrial Products. Wenbin Xiang

page 2 11/6/2005 Agenda  Introduction  Overview of a change-oriented CM tool  Change management process  Change measurement  Conclusion  Question?

page 3 11/6/2005 Introduction Is this topic related to this class? Software Configuration Management -Chapter 8 Capability Maturity Model Personal experience -ClearCase (Version control) -ClearQuest (Defect control) Change-oriented SCM tools -Logical change -Rather than component change

page 4 11/6/2005 Overview of SDE – a Change-oriented CM Tool  Version management - File level 1.Check out a special file version 2.Modify the file 3.Check back in 4.A new file version created (Maybe in your private branch, merge to main branch) What is the problem? Example

page 5 11/6/2005 Overview of SDE – a Change-oriented CM Tool  Configuration management - System level 1.A configuration consists of a tree structure of subsystems 2.A subsystem collects files which make a logical (sub)function of the system  Reason for different configurations 1.Parallel development 2.Different product version A system version is a tag on the file (Create a label in Clearcase)

page 6 11/6/2005 Overview of SDE – a Change-oriented CM Tool Changes in version states in the development process

page 7 11/6/2005 Overview of SDE – a Change-oriented CM Tool  Change Management Change Request (CR) Requirement Specifications Error Reports A text file Priority,CR type Creation date and termination date A list of files with version Under vision control

page 8 11/6/2005 Change Management Process Controlling change request during the development process

page 9 11/6/2005 Change Management Process Change request in a development process

page 10 11/6/2005 Change Measurements Software metrics in change request Size type metrics 1.Number of changes 2.States 3.Classification a.Priority b.Type or function c.Number of change files Process metrics The history of every change (state)

page 11 11/6/2005 Change Measurements Spiral model and evolutionary prototype model

page 12 11/6/2005 Change Measurements Waterfall model

page 13 11/6/2005 Conclusion A change-oriented tool Focus from the tool to the process Version management remains before Change management more important Increate possibility of supervising a project Lead to better plan Know the project’s final stage early Problems: If the two CR related to same files? Private branch?

page 14 11/6/2005 Questions