Session SDLC

8/10/2019 Session SDLC

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Buildingnewinformationsystem

ChangeManagement(People) Technolo Chan e Technolo

SpecificBusinessProcesses

CommonformofITenabledorganizationalchange

Automation

Redesigning

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ClassicalSystemDevelopmentLifeCycle

Prototype

Model

Approach SpiralModelApproach

FourthGenerationTechniques

HybridApproach

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Plannin Risk Analysis

EngineeringCustomer

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Evaluation


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Emphasizestheverificationandva a on o epro uc .

Theproductfromeveryphase

needstobecheckedand

approvedbeforemovingforward.

parallel.

Itisnotproposedforshortterm

u v w eachstage.


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' '

Agilemethodologyhasanadaptiveteamwhichisabletorespondtothechangingrequirements.

Coreprinciples Continuoustestingandvalidation

Consistentteamcollaboration

Ongoingcustomerinvolvement

Frequentdeliveryofworkingsoftware

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SystemAna yst

InfrastructureAnal st

ProjectManager

Enduser

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STEP1.ThePreliminary

Investigation

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Problem

Definition:

tatemento o ect ves scopeo pro ems

Roughestimatesoftime&resources

Endresultsofpreliminaryinvestigationsare:

SystemObjectives

System

environment

FeasibilityStudy:

EconomicFeasibility

OperationalFeasibility

Sc e u eFeasi i ity

OrganizationalFeasibility11


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TechnicalFeasibility Ist erequisitetec no ogyavai a ean proven?

Aretherelevanttechnicalskillsavailabletoexploitit?

Familiaritywithtechnology

Haveweuseditbefore? Hownewisit? Compatibilitywithexistingsystems

Howtoincreaseproductivity?

Howtoreduceworkforce&expensegrowthrate?

Costsavings

Increasedprofits12


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Isthedatabaseavailable&reliable? DoestheMIShavemanagementsupport?

Determinesthesystemwillbeusedasintendedtoits

full

capacity

ScheduleFeasibility:

Whether ro ectcanbefinishedwellbeforetheactual

requirementofitsusage.

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ANALYSIS

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1. Analysisofthepresentsystem

Reviewhistoricalfacts/Analyzeinputs

Reviewmethods&procedures

Anal zeout uts

Reviewinternalcontrols

.

3. Developinganewsystem

Report requestforapprovaltoproceedwithdevelopmentinparticularmanner.

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S stemDevelo mentTools AnalysisTool

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PictorialRepresentationofanalgorithm Importance

Ma ingLogic ear

ProperCommunication

EffectiveAnalysis

UsefulinCoding

ProperTesting

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orportionofsystem.Itconsistsofdataflows,processes,sources,destinations,andstores alldescribedthroughthe.

Describeflowofdatainsystemwithonlyfoursymbols:

Processes

Datadirection

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Process

Data flow

Data store

External

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ent ty


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Employee SINK

Accounts Gross Salar

Employee.

Data

Employees

Gross Salary

Salary

Statement

Department Processing

Computation

Updated DataSOURCE

Updated Data on

Employee

Various

Deductions

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framework.

u u u w structuring

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customerpaysa vance

then Give5%discountelse

purc aseamount 10,000then

if customerisaregularcustomer

thenve5 scoun

elseNodiscount

endif

e se Nodiscountendif

endif

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Theseareappropriatewhenalargenumberofconditionsare

tobecheckedinarrivingatasetofactions

Rulesareformed

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thengive5%discount

RULE2: Ifnoadvancepaymentismadeandifthepurchaseamount 10,000andthecustomerisaregularcustomerthengive5%discount

RULE3: Ifnoadvancepaymentismadeandifthepurchaseamountis 10,000andthecustomerisnotaregularcustomerthengivenodiscount

RULE4: Ifnoadvancepaymentismadeandifthepurchaseamountisnot 10,000thengivenodiscount

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Conditions Rule1 Rule2 Rule3 Rule4Advancepaymentsmade? Y N N N

Purchaseamount 10,000? Y Y NRegularcustomer Y N

Actions

Give %discount X X

NoDiscount X X

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Graphicalwayofdepictingifthenelselogic

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Custom Packaged System OutsourcingDevelopment

Businessneed The business need isunique The business needis common The business need isnot core to the business

In-houseexperience

In-house functionaland technicalexperience exists

In-housefunctionalexperience exists

In-house functional ortechnical experiencedoes not exist

Pro ect skills Desire to build in- Skills are not Outsourcin is ahouse skills

strategic

strategic decision

Projectmanagement

Have highly skilledproject manager and

Project managercan coordinate

Highly skilled projectmanager at appropriate

Time frame Time frame is Time frame is short Time frame is short or

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System

Acquisition

&

Testing

HardwareandSoftware Acquisition

Testing

Documentation

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System Documentation Intendedtohelpprogrammersandanalysts

understandandmaintainthesystemafteritis

installed

User Documentation

Intendedtohelpusersoperatethesystem

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Transitionin tonews stemsinvolvesmana in chan efrompreexistingnormsandhabits.

Chan emana ementinvolves:

Unfreezing

loosening

up

peoples

habits

and

norms

Moving transitionfromoldtonewsystems

Refreezing institutionalizeandmakeefficientthenewwayofdoingthings

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Risk

Cost

Time

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ystemma ntenance saprocesso re n ngt esystemto

makesurethatitcontinuestomeetbusinessneeds.

WhyRequired?

Bugs

in

the

system Enhancementtothesystem

Software&networkchanges

Tochangeinorganizationsstrategy

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Documents

Session SDLC