CS162 Operating Systems and Systems Programming Lecture 18 TCP ’ s Flow Control, Transactions
Systems Development and Analysis Lecture 3 (Chapter 18 & 20)
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Transcript of Systems Development and Analysis Lecture 3 (Chapter 18 & 20)
![Page 1: Systems Development and Analysis Lecture 3 (Chapter 18 & 20)](https://reader035.fdocuments.us/reader035/viewer/2022062308/56649d305503460f94a09133/html5/thumbnails/1.jpg)
Systems Development and Analysis
Lecture 3(Chapter 18 & 20)
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©2003 Prentice Hall Business Publishing, Accounting Information Systems, 9/e, Romney/Steinbart
Lecture 3-2
Introduction
This lecture discusses four topics: system development life cycle (SDLC) planning techniques and activities necessary
during the development of the life cycle process of demonstrating the feasibility of a
new AIS behavioral aspects of change that companies
must deal with to successfully implement a new system
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©2003 Prentice Hall Business Publishing, Accounting Information Systems, 9/e, Romney/Steinbart
Lecture 3-3
The Systems Development Life Cycle
What are the five steps in the SDLC?1. Systems analysis
2. Conceptual design
3. Physical design
4. Implementation and conversion
5. Operations and maintenance
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©2003 Prentice Hall Business Publishing, Accounting Information Systems, 9/e, Romney/Steinbart
Lecture 3-4
The Systems Development Life Cycle
Systems Analysis
Conduct initial investigation
Conduct system survey
Conduct feasibility study
Determine information needs and system requirements
Deliver systems requirements
Feasibility analysis and decision points
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©2003 Prentice Hall Business Publishing, Accounting Information Systems, 9/e, Romney/Steinbart
Lecture 3-5
The Systems Development Life Cycle
Feasibility analysis and decision points
Conceptual Design
Evaluate design alternatives
Develop design specifications
Deliver conceptual design requirements
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©2003 Prentice Hall Business Publishing, Accounting Information Systems, 9/e, Romney/Steinbart
Lecture 3-6
The Systems Development Life Cycle
Feasibility analysis and decision points
Physical Design
Design:output/database/input
Develop programs
Develop procedures
Design controls
Deliver developed system
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©2003 Prentice Hall Business Publishing, Accounting Information Systems, 9/e, Romney/Steinbart
Lecture 3-7
The Systems Development Life Cycle
Feasibility analysis and decision points
Implementation and Conversion
Develop plan Install hardware and software
Train personnel, test the system Complete documentation Convert from old to new system
Fine-tune and review Deliver operational system
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©2003 Prentice Hall Business Publishing, Accounting Information Systems, 9/e, Romney/Steinbart
Lecture 3-8
The Systems Development Life Cycle
Operation and Maintenance Operate system
Modify system Do ongoing maintenance Deliver improved system
SystemsAnalysis
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©2003 Prentice Hall Business Publishing, Accounting Information Systems, 9/e, Romney/Steinbart
Lecture 3-9
The Players
Who are the people involved in developing and implementing AIS?– management– accountants– information systems steering
committee– project development team– systems analysts and programmers– external players
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©2003 Prentice Hall Business Publishing, Accounting Information Systems, 9/e, Romney/Steinbart
Lecture 3-10
Feasibility Analysis
What five important aspects need to be considered during a feasibility study?
1. Technical feasibility
2. Operational feasibility
3. Legal feasibility
4. Scheduling feasibility
5. Economic feasibility
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©2003 Prentice Hall Business Publishing, Accounting Information Systems, 9/e, Romney/Steinbart
Lecture 3-11
Feasibility Analysis
Economic feasibility is the most frequently analyzed of the five aspects.
What is the basic framework for feasibility analysis?– capital budgeting model
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©2003 Prentice Hall Business Publishing, Accounting Information Systems, 9/e, Romney/Steinbart
Lecture 3-12
Feasibility Analysis
What are some capital budgeting techniques?– payback period– net present value (NPV) – internal rate of return (IRR)
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©2003 Prentice Hall Business Publishing, Accounting Information Systems, 9/e, Romney/Steinbart
Lecture 3-13
Capital Budgeting Example
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©2003 Prentice Hall Business Publishing, Accounting Information Systems, 9/e, Romney/Steinbart
Lecture 3-14
Behavioral Aspects of Change
Individuals involved in systems development are agents of change who are continually confronted by people’s reaction and resistance to change.
The best system will fail without the support of the people it serves.
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©2003 Prentice Hall Business Publishing, Accounting Information Systems, 9/e, Romney/Steinbart
Lecture 3-15
Behavioral Aspects of Change Why do behavioral problems occur?
– personal characteristics and background
– manner in which change is introduced– experience with prior changes– communication– disruptive nature of the change
process– fear
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©2003 Prentice Hall Business Publishing, Accounting Information Systems, 9/e, Romney/Steinbart
Lecture 3-16
Behavioral Aspects of Change
How do people resist AIS changes?– aggression– projection– avoidance
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©2003 Prentice Hall Business Publishing, Accounting Information Systems, 9/e, Romney/Steinbart
Lecture 3-17
Behavioral Aspects of Change
How can behavioral problems be improved?– meet needs of the users– keep communication lines open– maintain a safe and open atmosphere– obtain management support– allay fears– solicit user participation
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©2003 Prentice Hall Business Publishing, Accounting Information Systems, 9/e, Romney/Steinbart
Lecture 3-18
Behavioral Aspects of Change
– provide honest feedback– make sure users understand the system– describe new challenges and opportunities– reexamine performance evaluation– avoid emotionalism– present the system in the proper context– control the users’ expectations– keep the system simple
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©2003 Prentice Hall Business Publishing, Accounting Information Systems, 9/e, Romney/Steinbart
Lecture 3-19
End of Lecture 3