Concept of Information Systems
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Concept of Information Systems
system• A set of interacting components that
operate together to accomplish a purpose
What is a SYSTEM?
• A system is a group of interrelated components working together toward a common goal by accepting inputs and producing outputs in an organized transformation process.
S1S2
S3S4
Systems structure
Subsystems
Systems Boundary
Environment
Systems Input Output
Abstract Concept of a Systems
INPUT OUTPUTPROCESS
FEEDBACK
System properties
• A system has– Purpose– Boundary– Environment– Inputs– Outputs
Example: a manufacturing system
INPUTof raw materials
OUTPUT of finished products
Manufacturing
PROCESS
Control byManagement
Control signals
Control signals
Feedback signals
Feedback signals
System Boundary
Environment
What is an Information Systems?
• An information system can be any organized combination of people, hardware, software, communications network, and data resources that collects, transforms, and disseminates information in an organization
Components of an Information System
Control
Input Process
Memory
Output
DataPeople
Software
network
computer
Information Systems Activities
• Input of Data– Manual input by key, scanning, sound, image,…
• Processing of Data into Information– Calculate, sort, find, report, disseminate……
• Output of Information Products– Report, display, suggestion, ……
• Storage of Data Resource– Database, data file, maintenance, …..
• Control of System Performance– Audit, ……
Phases in building and maintaining systems
• Initiation
• Development
• Implementation
• Operation & Maintenance
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