1

Chapter 9Chapter 9Software Configuration Software Configuration

ManagementManagement

2

The “First The “First Law”Law”

No matter where you are in the system No matter where you are in the system life cycle, the system will change, and the life cycle, the system will change, and the desire to change it will persist throughout desire to change it will persist throughout the life cycle.the life cycle.

Bersoff, et al, 1980Bersoff, et al, 1980

3

What Are These What Are These Changes?Changes?

datadata

otherotherdocumentsdocuments

codecodeTestTest

ProjectProjectPlanPlan

changes in changes in technical requirementstechnical requirements

changes in changes in business requirementsbusiness requirements

changes inchanges inuser requirementsuser requirements

software modelssoftware models

4

Software Configuration Software Configuration ItemsItems(SCIs)(SCIs)

programsprograms documentsdocuments

datadataThe piecesThe pieces

5

BaselinBaselinee

6

Software Configuration Software Configuration ItemsItems(SCIs)(SCIs)

7

SCM TasksSCM Tasks

Software EngineeringSoftware Engineering

a foundation

procedures

methods

toolsSCMSCM• • identificationidentification• • version controlversion control• • change controlchange control• • auditingauditing• • reportingreporting

8

IdentificatiIdentificationon

Object-oriented approachObject-oriented approachTypesTypes

• basic objectbasic object• aggregate objectaggregate object• FeaturesFeatures

namename descriptiondescription set of resourcesset of resources realizationrealization

• RelationshipRelationship Data model <part-of> design Data model <part-of> design

specificationspecification Data model <interrelated> data flow Data model <interrelated> data flow

modelmodel• EvolutionEvolution

Evolution graphEvolution graph

9

10

Change & SCMChange & SCM

Software EngineeringSoftware Engineering

a TQM foundation

procedures

methods

toolsSCMSCM• • identificationidentification• • version controlversion control• • change controlchange control• • auditingauditing• • reportingreporting

11

Version Version ControlControl

TechniquesTechniques•Evolution GraphEvolution Graph•Attribute TupleAttribute Tuple•Object PoolObject Pool

12

Evolution Evolution GraphGraph

13

Attribute Attribute TupleTuple

AttributesAttributes•customercustomer•development development languagelanguage

•development statusdevelopment status•hardware platformhardware platform•creation datecreation date

14

Object Object PoolPool

15

Change & SCMChange & SCM

Software EngineeringSoftware Engineering

a TQM foundation

procedures

methods

toolsSCMSCM• • identificationidentification• • version controlversion control• • change controlchange control• • auditingauditing• • reportingreporting

16

Change Control Change Control Process—IProcess—I

change request from userchange request from user

developer evaluatesdeveloper evaluates

change report is generatedchange report is generatedchange control authority decideschange control authority decides

request is queued for actionrequest is queued for action ECO generatedECO generated change request is deniedchange request is denied

user is informeduser is informed

need for change is recognizedneed for change is recognized

change control process—IIchange control process—II

17

Change Control Change Control Process-IIProcess-II

assign people to SCIsassign people to SCIs

check-out SCIscheck-out SCIs

make the changemake the change

review/audit the changereview/audit the change

establish a “baseline” for testingestablish a “baseline” for testing

change control process—IIIchange control process—III

““Check in” the SCIs that have been changedCheck in” the SCIs that have been changed

18

Change Control Change Control Process-IIIProcess-III

perform SQA and testing activitiesperform SQA and testing activities

promote SCI for inclusion in next releasepromote SCI for inclusion in next release

rebuild appropriate versionrebuild appropriate version

review/audit the changereview/audit the change

include all changes in releaseinclude all changes in release

distribute the new versiondistribute the new version

19

20

Change & SCMChange & SCM

Software EngineeringSoftware Engineering

a TQM foundation

procedures

methods

toolsSCMSCM• • identificationidentification• • version controlversion control• • change controlchange control• • auditingauditing• • reportingreporting

21

Configuration Configuration AuditAudit

Has the change Has the change specifiedspecified in the ECO in the ECO been made? Have any been made? Have any additionaladditional modifications been incorporated?modifications been incorporated?

Has a Has a formal technical reviewformal technical review been been conducted to assess technical conducted to assess technical correctness?correctness?

Has the Has the software processsoftware process been been followed and have software followed and have software engineering engineering standardsstandards been been properly applied?properly applied?

22

Has the change been Has the change been ““highlightedhighlighted” in the SCI? Have ” in the SCI? Have the change the change datedate and change and change authorauthor been specified? Do the been specified? Do the attributesattributes of the configuration of the configuration object reflect the change?object reflect the change?

Have Have SCM proceduresSCM procedures for noting for noting the change, recording it, and the change, recording it, and reporting it been followed?reporting it been followed?

Have Have all related SCIsall related SCIs been been properly updated?properly updated?

23

Configuration Status Configuration Status ReportingReporting

(CSR)(CSR)

SCIsSCIs

ChangeChangeRequestsRequests

Change Change ReportsReports ECOsECOs

Status AccountingStatus Accounting

ReportingReporting

24

Software Project Software Project PlanPlan