Introduction to Information Systems and Types of Information Systems

What is an Information System (IS)? (In Simple Words)

Before we learn how to secure an organization’s data, we must first understand what an Information System (IS) is!

In simple words, an Information System (IS) is an organized combination of people, hardware, software, communication networks, data, and policies that collects raw Data, processes it, stores it, and turns it into meaningful Information to help a company run smoothly and make smart decisions.

💡 Data vs. Information (Real-Life Example):

• Raw Data: "101, Rahul, 85, 90, 78" (Just raw numbers and words).
• Information: "Roll No. 101 (Rahul) scored 84.3% in BCA 6th Semester and passed with Distinction!"
  The college portal that collects marks from teachers, calculates the percentage, and prints your marksheet is an Information System!

1. The 5 Core Components of an Information System

Every Information System in the world—whether at SBI Bank, Indian Railways (IRCTC), or DAVV University—is made up of 5 essential components:

(Note: Many textbooks also list Networks / Telecommunications as a 6th component that connects all hardware and people together).

2. Types of Information Systems (The Organizational Pyramid)

In any large company or bank, different employees at different management levels need different kinds of information:

• A Cashier at a bank counter needs to record daily deposits and withdrawals.
• A Branch Manager needs weekly performance reports.
• The CEO at the top needs 5-year strategic market trends.

Therefore, Information Systems are classified into 4 main levels arranged as a Pyramid:

1. Transaction Processing System (TPS) — Operational Level

• What it is: The foundational system at the bottom of the pyramid that records and processes day-to-day routine business transactions in real time.
• Who uses it: Clerks, cashiers, front-desk staff, and customers.
• Real-Life Examples:
  • ATM Withdrawal or UPI payment on PhonePe.
  • Supermarket barcode billing counter (DMart / Reliance Smart).
  • IRCTC train ticket booking and college fee payment receipts.
• Security Need: If TPS goes down for even 10 minutes, the entire business stops! It requires 99.999% Availability and strong ACID Integrity.

2. Management Information System (MIS) — Middle Management Level

• What it is: An MIS takes the raw daily transaction data collected by the TPS, summarizes it, and generates structured weekly, monthly, or yearly reports for managers.
• Who uses it: Middle-level managers (Branch Managers, Sales Managers, HODs).
• Real-Life Examples:
  • A monthly report showing: “Total sales in Indore branch this month vs. last month.”
  • A college attendance summary report showing students with less than 75% attendance.

3. Decision Support System (DSS) — Senior Management Level

• What it is: An interactive analytical system that helps senior managers solve semi-structured or unique, non-routine problems using mathematical models, simulations, and “What-If” analysis.
• Who uses it: Senior managers, financial analysts, supply-chain planners.
• Real-Life Examples:
  • “What will happen to our company’s profit if we increase the product price by 10% and raw material cost rises by 5%?”
  • Airline ticket dynamic pricing systems and bank loan risk calculators.

4. Executive Support System (ESS) / Executive Information System (EIS) — Strategic Top Level

• What it is: Sits at the very top of the pyramid. It combines internal data (from MIS and DSS) with external market news (competitor data, stock market trends, tax laws) and displays them on visual Graphical Dashboards for top leaders.
• Who uses it: CEO, CFO, Directors, and University Vice-Chancellors.
• Real-Life Examples:
  • A live CEO dashboard showing company market share across India and deciding whether to open a new factory or acquire a startup.

5. Other Specialized Information Systems

• OAS (Office Automation System): Word processors, spreadsheets, email, and video conferencing (MS Office, Google Workspace, Zoom).
• KMS (Knowledge Management System) & Expert Systems: Captures the expertise of senior engineers/doctors so the entire organization can learn from it.
• ERP (Enterprise Resource Planning): Integrates all departments (HR, Finance, Inventory, Sales) into one unified database (e.g., SAP, Oracle ERP).

3. Summary Comparison Table: TPS vs. MIS vs. DSS vs. ESS

💡 DAVV Exam Preparation Tips

10-Mark Question: “What is an Information System? Explain its components and describe the different types of Information Systems with a neat diagram.”

• Define Information System and distinguish between Data and Information.
• List the 5 components (Hardware, Software, Data, People, Procedures).
• Draw the 4-Tier Pyramid Diagram (TPS at bottom → MIS → DSS → ESS at top) and include the summary comparison table!