Systemanalysisanddesign2 110307052517-phpapp01
- 1. System analysis andSystem analysis and designdesign
- 2. Information SystemsInformation Systems DevelopmentDevelopment InvestigationInvestigation AnalysisAnalysis DesignDesign ImplementationImplementation MaintenanceMaintenance
- 3. The steps involved in system analysisThe steps involved in system analysis are:are: 2.2. Fact findingFact finding 3.3. A feasibility studyA feasibility study 4.4. Analysis phaseAnalysis phase 5.5. System designSystem design 6.6. ImplementationImplementation 7.7. TestingTesting 8.8. DocumentationDocumentation 9.9. evaluationevaluation
- 4. Fact findingFact finding It means that we need to find outIt means that we need to find out how things are done at the momenthow things are done at the moment How can we do that?How can we do that?
- 5. Fact findingFact finding There are four main ways of finding outThere are four main ways of finding out about existing systems these are :about existing systems these are : 2.2. Ask questions (interviewing people).Ask questions (interviewing people). 3.3. Getting people to fill in carefully designedGetting people to fill in carefully designed questionnaires.questionnaires. 4.4. Sitting with various people to observeSitting with various people to observe how the job is done at the momenthow the job is done at the moment 5.5. Inspecting any bits of paper ,screenInspecting any bits of paper ,screen displays and files which are used in thedisplays and files which are used in the present system.present system.
- 6. At the end of this procedures youAt the end of this procedures you should write down a report whichshould write down a report which describe the existing system with adescribe the existing system with a description of the output neededdescription of the output needed from the new system .from the new system . Example…….Example…….
- 7. Feasibility studyFeasibility study It looks at the chances of being ableIt looks at the chances of being able to solve a particular problem at ato solve a particular problem at a reasonable cost.reasonable cost. Feasibility report : it’s the documentFeasibility report : it’s the document produced at the end of the study andproduced at the end of the study and will give an idea of the time thewill give an idea of the time the project is likely to take along someproject is likely to take along some estimate of cost.estimate of cost.
- 8. When the feasibility study ends?When the feasibility study ends? It will end when a decision has beenIt will end when a decision has been reached whether or not to proceedreached whether or not to proceed with the project .with the project .
- 9. Feasibility studyFeasibility study technically feasibletechnically feasible - is the new- is the new system technically possible tosystem technically possible to implement in the time available?implement in the time available? economically viableeconomically viable - will the cost- will the cost of the new system be offset byof the new system be offset by savings once it is implemented? Insavings once it is implemented? In other words, will it save theother words, will it save the organisation money, time or alloworganisation money, time or allow them to perform more effectively?them to perform more effectively?
- 10. the feasibility study includes:the feasibility study includes: 2.2. A description of what the system is required toA description of what the system is required to do (objective of the system)do (objective of the system) 3.3. A preliminary design so that the costs may beA preliminary design so that the costs may be estimatedestimated 4.4. An alternative design so that the most suitableAn alternative design so that the most suitable once can be chosenonce can be chosen 5.5. A cost benefit analysis :this looks out theA cost benefit analysis :this looks out the benefit and makes sure that they out weightbenefit and makes sure that they out weight the coststhe costs 6.6. The conclusion : decide whether its worth goingThe conclusion : decide whether its worth going a head with the project and which design hasa head with the project and which design has been chosenbeen chosen
- 11. The feasibility reportThe feasibility report It’s a summary of the results of theIt’s a summary of the results of the feasibilityfeasibility It should include the following:It should include the following: 3.3. A brief description of the businessA brief description of the business and any problems with the existingand any problems with the existing one.one. 4.4. Details of what part of the businessDetails of what part of the business is being looked atis being looked at 5.5. The objective of the proposedThe objective of the proposed systemsystem 6.6. A list of some of the alternativeA list of some of the alternative
- 12. The feasibility reportThe feasibility report The human technical and economicThe human technical and economic factorsfactors ASK UR SELF HOW WE CAN GETASK UR SELF HOW WE CAN GET THAT???THAT???
- 13. 1.1. Do the stuff have the expertise toDo the stuff have the expertise to cope with the new systemcope with the new system 2.2. Is the technology available ..can itIs the technology available ..can it be done?be done? 3.3. Is there enough money to goIs there enough money to go ahead?ahead?
- 14. Feasibility reportFeasibility report A plan for the implementationA plan for the implementation A proposed course of action (i.e.A proposed course of action (i.e. what the consultant /system analystwhat the consultant /system analyst suggests the company should dosuggests the company should do next)next)
- 15. Analysis phaseAnalysis phase We use the feasibility study in thisWe use the feasibility study in this phase to design the new systemphase to design the new system You should go in detail more thanYou should go in detail more than the feasibility study to find thethe feasibility study to find the weaknesses of the system .weaknesses of the system . In the analysis phase ,the chartsIn the analysis phase ,the charts (system flow charts and data flow(system flow charts and data flow diagrams) to help the analyst todiagrams) to help the analyst to understand the present systemunderstand the present system
- 16. Analysis phaseAnalysis phase The analysis phase includes :The analysis phase includes : 2.2. Detailed objectives of the proposedDetailed objectives of the proposed systemsystem 3.3. Facts about the parts of the old systemFacts about the parts of the old system being replaced by the new systembeing replaced by the new system 4.4. Any constraints on the systemAny constraints on the system 5.5. An update of the cost /benefit analysisAn update of the cost /benefit analysis based on the new informationbased on the new information
- 17. 5.An update of the plan for further5.An update of the plan for further development of the systemdevelopment of the system This will include the responsibilities ofThis will include the responsibilities of the members of the team involvedthe members of the team involved with the project and deadlines bywith the project and deadlines by which the stage must be completedwhich the stage must be completed