Systems_Overview IA SDLC Overview

8/9/2019 Systems_Overview IA SDLC Overview

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The System Development LifeCycleWhat is an information system (IS)?

Hardware, software, data,

people, and procedures that

work together to produce

quality information

Hardware, software, data,

people, and procedures that

work together to producequality information

SystemSet of components

that interact to achieecommon goal

SystemSet of components

that interact to achiee

common goal

!usinesses use many types of

systems

!usinesses use many types of

systems


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The System Development LifeCycleWhat are the phases of the system deelopment cycle?

Phase 1. Planning

Phase 2. Analysis

Phase 3. Design

Phase 4. ImplementationPhase 5. Support

Review project requests

Prioritize project

requests Allocate resources

Identify project

development team

Conduct preliminary investigation

Perform detailed analysis activities:

Study current system

Determine user requirements

Recommend solution

Acquire ardware

and software! if

necessary

Develop details of

system

Develop programs! if necessary

Install and test new system

"rain users

Convert to new system

Conduct post#implementation

system review

Identify errors and enancements

$onitor system performance


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"rrange tasks into phases

(groups of actiities)

The System Development LifeCycleWhat are guidelines for system deelopment?

Inole users(anyone for whom

system is #eing #uilt)

$eelop clearly defined standards(procedurescompany e%pects employees to follow)


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The System Development LifeCycleWhat is a systems analyst?

&esponsi#le for designing&esponsi#le for designing

and deelopingand deeloping

information systeminformation system

'iaison #etween users'iaison #etween users

and I professionalsand I professionals


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The System Development LifeCycleWhat is theproect team?

Consists of users, systems analyst, and other IT professionals

Formed to work on project from beginning to end

Project leaderone member of the team who

manages and controls project budget and schedule


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The System Development LifeCycleWhat is documentation?

Includes reports, diagrams,

programs, and other deliera#les

0ollection and summari1ation

of data and information


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The System Development LifeCycleWhat are si% data and information gathering techniques?

&eiew documentation +#sere 2uestionnaire Interiew 3oint4application

design (3"$) session &esearch


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The System Development LifeCycleWhat are some reasons to create or modify an

information system?

0ompetition canlead to change

o improe

e%isting system

+utside group maymandate change

o correct pro#lem

in e%isting system


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The System Development LifeCycleWhat is a request for system serices? ormal request for

new or modified

information system

Also called

proect request


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The System Development LifeCycleWhat is the planning phase?

!egins when steering committee receies proect request

SteeringSteering

committeecommittee

decision4makingdecision4making#ody for the#ody for the

companycompany

unction of committee-

&eiew and&eiew and

approe proectapproe proect

requestsrequests

"llocate"llocate

resourcesresources

orm proectorm proectdeelopmentdeelopment

team for eachteam for each

approedapproed

proectproect

5rioriti1e5rioriti1e

proect requestsproect requests


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The System Development LifeCycleWhat is the analysis phase?

0onduct preliminary0onduct preliminary

inestigation, alsoinestigation, also

called feasi#ilitycalled feasi#ilitystudystudy

5erform detailed5erform detailed

analysisanalysis


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The System Development LifeCycleWhat is the preliminary inestigation? $etermine e%act nature of pro#lem or improement

and whether it is worth pursuing %indings are presented in feasi&ility report! also 'nown as a feasi&ility study


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The System Development LifeCycleWhat is detailed analysis?

Sometimes called logical design

() Determine user*s wants! needs!

and requirements

+) Recommend solution

,) Study ow current system

wor's


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Presented toPresented to

steeringsteering

committee,committee,

which decideswhich decideshow system willhow system will

be developedbe developed

The System Development LifeCycleWhat is the

system proposal? AssessesAssessesfeasibilityfeasibility

of eachof each

alternativealternative

solutionsolution

RecommendsRecommends

the mostthe most

feasiblefeasible

solution forsolution for

the projectthe project


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The System Development LifeCycleWhat is the design phase?

Acquire ardware and softwareAcquire ardware and software

Develop all details of new or

modified information system

Develop all details of new or

modified information system


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7isit endors6 stores7isit endors6 stores7isit endors6 stores7isit endors6 stores

The System Development LifeCycleWhat is needed to acquire new hardware and software? Identify all hardware and software requirements of new or

modified system

Surf We#Surf We#Surf We#Surf We#

&ead print and&ead print and

online trade ournals,online trade ournals,newspapers, andnewspapers, and

maga1inesmaga1ines

&ead print and&ead print and

online trade ournals,online trade ournals,newspapers, andnewspapers, and

maga1inesmaga1ines

alk with otheralk with other

systems analystssystems analysts

alk with otheralk with other

systems analystssystems analysts


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The System Development LifeCycleWhat are three #asic documents used to summari1e

technical specifications?

'ess formal method

that uses standard

form to request

information a#out

product or serice

7endor quotes

price(s) for

listed

product(s)

7endor selects

product(s) that

meet(s) your

requirements andthen quotes price(s)

Identifies

product(s)

you want

&equest for information (&I)&equest for information (&I)

&equest for proposal (&5)&equest for proposal (&5)

&equest for quotation (&2)&equest for quotation (&2)


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The System Development LifeCycleHow do systems analysts test software products? &eferences from endor alk to current users of product 5roduct demonstrations rial ersion of software !enchmark test measures performance

h l if


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The System Development LifeCycleWhat is a detailed design?

Includes several activities

Data&ase

design

Data&ase

designInput and

output design

Input and

output designProgram

design

Program

design

Detailed design specifications for components in proposed solution

h l if


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The System Development LifeCycleWhat is a mockup? Sample of input or output that contains actual data


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Th S D l Lif


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The System Development LifeCycleWhat is computer4aided software engineering (0"S.)? Software tools designed to support actiities of system

deelopment cycle

Th S D l Lif


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0onert to new system0onert to new system

The System Development LifeCycleWhat is the implementation phase? 5urpose is to construct, or #uild, new or modified

system and then delier it to users

rain usersrain users

Install and test new systemInstall and test new system

$eelop programs$eelop programs

Th S t D l t Lif


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The System Development LifeCycleWhat are the three types of tests performed #y system

deelopers?

7erifies application

works with other

applications

Systems test

Integration est

8nit est

7erifies eachindiidual program

works #y itself

7erifies all programsin application work

together

Th S t D l t Lif


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The System Development LifeCycleWhat istraining? Showing users e%actly

how they will use new

hardware and software

in system

Th S t D l t Lif


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The System Development LifeCycleWhat is the support phase?

0onductpost4implementation system reiewmeeting to find out if

information system is performing according to e%pectations

Identify errors

Identify enhancements

*onitor system performance

5roides ongoing assistance after system is implemented

Documents

Systems_Overview IA SDLC Overview