Πληροφοριακά Συστήματα
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Transcript of Πληροφοριακά Συστήματα
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& : Alan Dennis, Barbara Haley Wixom, Systems Analysis Design, 2nd ed., J Wiley, 2003. 2 -
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2 . . .
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1
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'' . 42% , 53% .
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(systems analyst) - , . .
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... , (gradual refinement)
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( ; ;) ( , , ;) ( ;) ( )
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1. () (project plan)
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2.
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3.
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4. (conversion plan)
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(planning)
(analysis)
(design)
(implementation) (feasibility analysis)
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; : (structured design) (rapid application development) (agile development)
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Waterfall model
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, , ( ) (milestones) . .
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,
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Parallel development
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,
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: CASE (Computer-Aided Software Engineering) 4 /
Rapid Application Development, RAD
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Computer-Aided Systems Engineering (=) , , UML, stubs (= ) , , .
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Insert Figure 1-4 herePhased development
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Prototyping
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. , . , .
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Throw-away prototype
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: Agile Development: Extreme Programming
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. 6 . PC , . 6 , . () . , . , . ; , . . : . , .
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: , , , : , , , , . : , , , ,
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: 2
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. . .
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. .
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; . (project sponsor) . ( ). .
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. :
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- - 750.000 1,8
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. , . .
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, ; ; ( ); ;
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: .
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1. ; ; ; ; , ,
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2. ; . (cash flow) (Return On Investment, ROI) (break even point)
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, ( , ) .
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: , .2,5
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3. , ; ;
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, . , : , , , , , ,
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.
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. : .
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15% 20% 35% 30%
4 5.33 9.33 8()
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, . (milestones)
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Gantt
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PERT
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, 8-10 ;
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. , . , , . . .
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: 3
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. . . .
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; . , . .
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: : '' , , Web, 10, , ,
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' ' :
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. , . : (Business Process Automation, BPA) (Business Process Improvement, BPI) (Business Process Reengineering, BPR)
BPA BPI BPR0 ++
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1. :
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(problem analysis) ' ' (root cause analysis) . .
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2. :
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Duration Analysis: . , . 8 , 20 . : .
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Activity-based costing: . () . .: 50, 18 22.000 (, , , , , )
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Informal benchmarking: . .
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3. :
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Outcome analysis: . . (;) .
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Technology analysis: . . (brain-storming) .
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Activity elimination: . ., .
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1. Interviews: :
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. (, ) , . . . , . ; . / .
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2. Joint Application Development, JAD: . 10-20 5-10 3 . .1-2 . .
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JAD
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JAD . . , . . , . .
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JAD (e-JAD) . : . .
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3. Questionnaires: , ( web forms). ( ). .
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4. Document analysis: , , , ( ) / ( ).
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5. Observation: () . . : / . . .
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. .
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( & ) , . . , . : , JAD, , . .
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4
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. .: , ' '. , ' '.
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(use case) . . . .
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, . .
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. , , . . . . UML. .
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. (, . , ). . . , . . . . , , .
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, . .
& 5000: (' ) 3 / . Engineering Business Administration.
[email protected] http://www.syros.aegean.gr/users/gaviotis/is & 5000: (' ) 3 [email protected] http://www.syros.aegean.gr/users/gaviotis/is & 5000: (' ) 3 [email protected] http://www.syros.aegean.gr/users/gaviotis/is & 5000: (' ) 3 [email protected] http://www.syros.aegean.gr/users/gaviotis/is & 5000: (' ) 3 . . , , , , . . , , , SAP consultant. [email protected] http://www.syros.aegean.gr/users/gaviotis/is & 5000: (' ) 3 [email protected] http://www.syros.aegean.gr/users/gaviotis/is & 5000: (' ) 3 [email protected] http://www.syros.aegean.gr/users/gaviotis/is & 5000: (' ) 3 [email protected] http://www.syros.aegean.gr/users/gaviotis/is & 5000: (' ) 3 [email protected] http://www.syros.aegean.gr/users/gaviotis/is & 5000: (' ) 3 [email protected] http://www.syros.aegean.gr/users/gaviotis/is & 5000: (' ) 3 [email protected] http://www.syros.aegean.gr/users/gaviotis/is & 5000: (' ) 3 [email protected] http://www.syros.aegean.gr/users/gaviotis/is & 5000: (' ) 3 [email protected] http://www.syros.aegean.gr/users/gaviotis/is & 5000: (' ) 3 [email protected] http://www.syros.aegean.gr/users/gaviotis/is & 5000: (' ) 3 [email protected] http://www.syros.aegean.gr/users/gaviotis/is & 5000: (' ) 3 [email protected] http://www.syros.aegean.gr/users/gaviotis/is & 5000: (' ) 3 [email protected] http://www.syros.aegean.gr/users/gaviotis/is & 5000: (' ) 3 [email protected] http://www.syros.aegean.gr/users/gaviotis/is & 5000: (' ) 3 [email protected] http://www.syros.aegean.gr/users/gaviotis/is & 5000: (' ) 3 : . , , . : . : ; ; ; . [email protected] http://www.syros.aegean.gr/users/gaviotis/is & 5000: (' ) 3 [email protected] http://www.syros.aegean.gr/users/gaviotis/is & 5000: (' ) 3 [email protected] http://www.syros.aegean.gr/users/gaviotis/is