Briefly explain the main classes of IS under the following headings

Transaction processing systems
 A transaction processing system collects and stores information about transactions and controls some aspects of transactions
What are the primary characteristics of TPS

• It is often tied to other sytems
• serves the most elementary day to day operations of an organisation
• used at the operational level of the business
• often critical to survival of the organisation
• Need to be fault tolerant
• Predefined and structured tasks
• Supplies data for high level of management
• High volumes of inputs and outputs 

What are the components of information systems infrastructure:

1. Hardware
2. Software
3. Data
4. People
5. Networks / transmission channels
6. Procedures

What are the application areas of Transaction processing systems:
Please use these functional application areas and explain in detail

1. Payroll system
2. Billing system
3. Ordering system
4. Customer ledgers
5. Point of sale system