15111 computer-aided tools(1)

8/4/2019 15111 Computer-Aided Tools(1)

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Computer-aided toolsComputer-aided tools


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Role of tools in systemRole of tools in system

developmentdevelopment Tools are essential for systems analysis.Tools are essential for systems analysis.

TheyThey improvemprove the manner in which thethe manner in which thedevelopment occurs anddevelopment occurs and influencenfluence thethequality of the final result.quality of the final result.


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Benefits of using toolsBenefits of using tools

Provide potential to improve productivityProvide potential to improve productivity Facilitate more effective procedureFacilitate more effective procedure Improve system quality.Improve system quality.

Note: Both the process of development andNote: Both the process of development andthe product can be improved by use ofthe product can be improved by use ofthese tools.these tools.


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Improve productivityImprove productivity

Development activities can be completed in lessDevelopment activities can be completed in lesstime.time.

Example: carpenter tools hammer.Example: carpenter tools hammer.

Same way Computer Aided tools help SA.Same way Computer Aided tools help SA.

Tools increase the analysts productivity byTools increase the analysts productivity byreducing the amount of time needed toreducing the amount of time needed todo cum en t , a n a l yz e a n d c on s t r u c t IS .o c um en t , a n a l y ze a nd c on s tr u c t I S .


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BenefitsBenefits

P R O C E S SR O C E S S P R O D U C TR O D U C TProductivityProductivity qualityquality

EffectivenessEffectiveness


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Improve information system qualityImprove information system quality

We expect quality of system delivered in aWe expect quality of system delivered in a

reasonable length of time.reasonable length of time.

Sometimes because of poor orSometimes because of poor orinexperience development practices,inexperience development practices,

analyst neglects to use tools.analyst neglects to use tools.

Application could not be prototyped evenApplication could not be prototyped evenwhen there is an apparent need to do so.when there is an apparent need to do so.


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Benefits of computer assisted toolsBenefits of computer assisted tools

Time needed to perform tasks decreasesTime needed to perform tasks decreases

Labor intensity is reducedLabor intensity is reduced

Procedures are followed consistentlyProcedures are followed consistently

Data describing the system are capturedData describing the system are captured

for storage in computer-readable form.for storage in computer-readable form.


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Decreased elapsed timeDecreased elapsed time

Example: saw powered by electricityExample: saw powered by electricity

Both analysis and construction activitiesBoth analysis and construction activities

can be achieved in less elapsed time.can be achieved in less elapsed time. Time to build prototype is reduced.Time to build prototype is reduced.

Of course skills are required to use CA-Of course skills are required to use CA-

Tools.Tools.

Duration of event decreased.Duration of event decreased.


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Ensure consistent procedureEnsure consistent procedure

Generation rules can be consistently andGeneration rules can be consistently and

accurately appliedaccurately applied


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Tedious timeTedious time

Automated data flow tools make itAutomated data flow tools make it

possible to turn the drawing process overpossible to turn the drawing process over

to computer software.to computer software.


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Capture system dataCapture system data

Capturing system detailsCapturing system details

Storage, processing, and retrieval: metaStorage, processing, and retrieval: meta

datadata


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Integration of front and back end

Analysis design [GAP] constructionimplementation


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Categories of automated toolsCategories of automated tools

H igh l e ve l too l si gh l e ve l t oo l s Analysis toolsAnalysis tools

Design toolsDesign tools

Specification toolsSpecification tools

Low l e v e l t o o lsow l e v e l t o o ls

Generator toolsGenerator tools Translation toolsTranslation tools Testing toolsTesting tools


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H igh l e v e l to o l sigh le v e l t o o l s Data flow diagrams

Structure charts

Data structure diagrams

Entity relationship diagrams


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Low le ve l t o o l sow le ve l t o o l s Flowcharts

Code generators

Languages

Prototyping tools


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High level specifications describes userrequirements such as i/p, o/p and performance

expectations Low level specifications address how the

prescribed requirements will be met throughcomputer-specific details.

Note: both must be developed effectively andaccurately to provide a system of satisfactoryquality.


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Front End ToolsFront End Tools

-Automate the early activities in SD process-Automate the early activities in SD process

-requirement analysis and logical design are-requirement analysis and logical design are

front end activitiesfront end activities

-support the development of graphic models-support the development of graphic models

of system and processesof system and processes


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Back End ToolsBack End Tools

-aimed at assisting analyst in the formation-aimed at assisting analyst in the formation

of programming logic, processingof programming logic, processing

algorithms, physical description of data.algorithms, physical description of data.-convert software logic designs into actual-convert software logic designs into actual

program codeprogram code

-brings application into existence-brings application into existence


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Integrated toolsIntegrated tools

-automates key tasks throughout the-automates key tasks throughout the

development processdevelopment process

-tools include both front end and back end-tools include both front end and back end

capabilitiescapabilities

-facilitate design, management ,-facilitate design, management ,

maintenance of codemaintenance of code

-provide environment for creation, storage,-provide environment for creation, storage,

manipulation ,management andmanipulation ,management and

documentation of systemsdocumentation of systems

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