System Analysis and Design (SAD) - Key Concepts
Introduction and Objective
- System Model: Based on the Input-Process-Output (IPO) model.
- Input is processed to produce an output.
- Transition from Manual to Computerized Systems:
- Replaced manual systems for better accuracy and speed.
- Developers understood manual systems before creating computerized ones.
What is a System?
- Definition:
- Greek origin meaning organized relationship among components.
- Orderly grouping of interdependent components linked together by plan to achieve a specific goal.
- Examples: Companies, railway systems, online booking are all systems with interconnected components.
Information System
- Definition: Arrangement of people, data, process, information presentation, and technology interacting to support and improve business operations.
- Important for enhancing business operations day-to-day.
Characteristics of a System
- Mnemonic: OI3C
- O - Organization
- I - Interaction
- I - Interdependence
- I - Integration
- C - Central Objective
Detailed Characteristics
- Organization:
- Structure and order in arranging components to achieve objectives.
- Interaction:
- Functions and components interact with each other.
- Interdependence:
- Components depend on each other within the system.
- Integration:
- How functions are tied together within the system.
- Central Objective:
- Unified goal for all system components, e.g., company profitability.
Study Tips
- Listen to the concept explanations multiple times to understand and memorize easily.
- For short answer questions, remember the simple definitions and characteristics.
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