Introduction to Computer Science and Engineering: Information Systems
Fundamentals of Data, Information, and Knowledge
Data
Defined as raw facts and isolated values that possess little or no inherent meaning until they are processed or interpreted.
Represents an elementary description of things, events, activities, and transactions.
Data is recorded, classified, and stored but is not categorized to convey a specific meaning in its raw state.
Information
Information consists of processed, manipulated, and interpreted data.
It is a collection of facts organized in a way that provides value beyond the facts themselves.
Data becomes information when it is organized to convey meaning and value to the recipient.
It is created by defining and organizing relationships among various data points.
Knowledge
Knowledge is the inference or conclusion drawn from information.
It involves data and/or information organized and processed to convey understanding, accumulated learning, experience, and expertise.
It is applied directly to current problems or activities.
Practical Example (The Festival Scenario)
Data: "", "May $2026$", "Asan Campus", "Festival". These are isolated values.
Information: "A Festival will take place at Sunmoon University Asan Campus from May to , ." This is data organized into a meaningful statement.
Knowledge: "I should plan a visit to Sunmoon University on the or of May." This is a conclusion or decision based on the information.
Characteristics of High-Quality Information
Accurate: Information must be free from errors. Inaccurate information often results from inaccurate data being fed into the transformation process.
Accessible: Information should be available to authorized users in the correct format whenever it is required to meet their specific needs.
Complete: Information must contain all important and related data. For example, an investment report that omits significant costs is considered incomplete.
Economical: The production of information should be cost-effective and time-efficient. Decision-makers must balance the value of the information against the cost of producing it.
Format: Information must be available in the specific format desired by the user.
Flexible: Information should be adaptable for different purposes. For example, inventory information can help sales representatives close deals, guide production managers on restocking, and inform finance executives of the company's total asset value.
Reliable: Information must be dependable and generated using correct, verified data.
Relevant: Information must be pertinent to the needs of the organization to be useful.
Secure: Only authorized individuals should have access; access for unauthorized users must be strictly denied.
Simple: Information must be easily understandable and usable. If it is too complex, it may fail to serve its intended purpose.
Timely: Information must be available at the exact moment it is needed. Late or outdated information is typically useless.
Verifiable: There must be a method available to cross-check and confirm the accuracy of the information.
Systems and Information Systems (IS): Concepts and Definitions
System Definition
A set of inter-related components that work together toward a common goal.
It accepts input, processes that input, and produces an output.
A system is typically composed of one or more subsystems.
Types of Systems
Open System: Interacts with other systems in its environment.
Closed System: A stand-alone system that does not interact with other systems.
Information System (IS) Definition
A set of inter-related components that collect data, manipulate it, disseminate both data and information, and provide feedback to achieve a specific objective.
Resources Used: People, hardware, software, data, and networks.
Activities: Input, processing, output, storage, and control.
Common Examples: Automated Teller Machines (ATMs), bus reservation systems, and course reservation systems.
Functional Components and Performance of Information Systems
Core Components
Input: The activity of gathering and capturing raw data.
Process: The transformation of data into useful output using mathematical or statistical tools.
Output: The generation and presentation of useful information, usually in the form of documents or reports.
Feedback: Output that is used to make adjustments or changes to the input or processing activities.
System Characteristics
Environment: Everything that exists outside the system.
Boundary: The line that separates the system from its environment.
Input/Output: Mechanisms where data moves from the environment into the system (Input) and information moves from the system back to the environment (Output).
Components: The individual subparts of the system.
Interrelationships: The associations or links between the various components.
Interface: The mechanism that allows different components of the system to interact with one another.
Measuring Performance
Efficiency: A measurement of the ratio between what is produced and what is consumed.
Effectiveness: The extent to which the system successfully attains its stated goals.
Strategic Importance of IS
Provides opportunities for new business models and increased profits/market share.
Improves decision-making and organizational performance through better data distribution.
Essential for strategic planning, creating new services, and improving existing ones.
Critical for securing data to prevent financial losses, lawsuits, and operational disruptions.
Enables the management and control of operations across different geographical countries.
Computer-Based Information Systems (CBIS)
Definition: A system that utilizes computer and telecommunication technology to generate information. It converts raw data into information through specific technological components.
Components of a CBIS
Hardware: Computer equipment used for input, processing, and output activities.
Software: Computer programs that govern and direct the operations of the computer.
Database: An organized collection of facts, typically involving two or more related data files.
People: The operators and users of the system. They are considered the most important element of a CBIS.
Procedures: The strategies, policies, methods, and rules established for using the CBIS.
Telecommunications: The electronic transmission of signals to enable communication.
Networks: Mechanisms used to connect computers and devices for electronic communication.
Internet: The world's largest computer network, formed by an interconnection of various networks.
Categories and Levels of Information Systems
Organizational Hierarchy
Information systems support all levels of an organization and different functional areas.
Vertical Divisions (Functional Areas): Sales, Marketing, Accounting, Human Resources (HR), and Manufacturing.
Horizontal Divisions (Operational Levels): Includes Low Level Operations, Middle Level Operations, and High Level (Top) Operations.
Hierarchy-Based Classification
A. Operations Support Systems (OSS)
Main Function: Transaction processing and focusing on day-to-day organizational activities.
Purpose: Support operations and keep track of resources and transactions.
Examples: Bank account balances, manufacturing inventory tracking, sales unit tracking.
Transaction Processing System (TPS): An organized collection of people, procedures, software, and devices used to record business transactions (e.g., money withdrawal, KTX ticket booking). TPS gathers input for other system types, automates data handling, and increases productivity.
Office Automation System (OAS): Supports office tasks and communication using text processing (word processors, spreadsheets) to create professional documents and communication systems (voice, video, image transmission).
B. Management Support Systems (MSS)
Purpose: Provide tools and information for decision-making at managerial and strategic levels. They help executives monitor operations, growth, profits, and performance.
Management Information System (MIS): Uses TPS data to provide information to managers. It generates Summary reports (statistical), Exception reports (abnormalities), and Detailed reports (operational). These can be Scheduled (periodic/weekly) or Ad-hoc (on-demand).
Decision Support System (DSS): Supports problem-specific decision-making for middle managers. It is user-friendly and highly interactive, applying logical and mathematical models for simulations and alternative comparisons.
Executive Information System (EIS): Provides top-level managers with summarized information to support strategic decisions, identify trends, and spot opportunities for future growth. It features menu-driven interfaces and interactive graphics.
C. Specialized Information Systems
Expert Systems (ES): An applied area of Artificial Intelligence (AI). It uses a Knowledge Base (rules/data) and an Inference Engine (logic) to replicate human decision-making for well-defined problems. Used for diagnosis, planning, and preserving rare human expertise.
Enterprise Resource Planning (ERP): Software that manages and coordinates all business functions from shared data stores. It integrates HR, supply chain, manufacturing, and finance. Example: SAP (System, Applications and Products).
E-Commerce: Involves electronic business transactions (buying/selling) using the Internet. Includes B2B (Business-to-Business), B2C (Business-to-Consumer), and C2C (Consumer-to-Consumer) models.
Careers in the Information Systems Department
Information Systems Department: Responsible for controlling, coordinating, and managing the information systems of an organization.
Key Roles
Chief Information Officer (CIO): The overall head of the IS department; ensures the organization achieves its goals using IS tools and personnel.
LAN Administrators: Responsible for setting up and managing network hardware, software, and security.
System and Network Operators: Focus on IS efficiency; manage the starting, stopping, and maintenance of hardware.
System Analysts and Programmers: Focus on development projects and IS maintenance. They identify needs and develop programs.
Additional Career Roles Mentioned:
Network / Communications Analysts
Software Engineers / Application Analysts
Database Administrators
Network / Systems Administrators
Application Designer
Management Analysts
Business Systems Analyst / Designers
Information Systems Auditors
Database Architects
ERP Analysts
Web Content Designers / Specialists
Questions & Discussion
Reference Material: The course content is based on the book Computer Fundamentals by Anita Goel (Chapter ).
Session Conclusion: The lecture concluded with a Q & A opportunity. Personnel details include Soualihou Ngnamsie Njimbouom (Presenter) dated May , .