Information systems are an important part of modern organisations. Businesses, schools, hospitals, and universities use them to process data and produce useful information for decision-making.
In this article, we will explore what information systems are, how they work, their characteristics, and the qualities of an effective information system.
1. What Is an Information System?
An information system is a system that processes data and produces meaningful information that people can use to make decisions.
Unlike physical systems that process materials such as food or fuel, information systems work with data, including numbers, words, symbols, and characters.
For example, a supermarket's information system records product sales, calculates the total revenue, and generates reports showing which products sell the most.
The resulting information helps management make better business decisions.
2. Components of an Information System
An information system can be understood through three basic activities:
- Input: Collecting raw data.
- Processing: Transforming the data into useful information.
- Output: Presenting the processed information to users.
Practical Example
Consider a university examination system:
- Input: Students' examination marks are entered into the system.
- Processing: The system calculates totals, averages, and grades according to predefined rules.
- Output: The system produces examination results and reports.
The main components are therefore processes that transform data rather than physical mechanisms such as gears or brakes.
3. Characteristics of Information Systems
A. Deterministic and Probabilistic
Information systems can be viewed as both deterministic and probabilistic, depending on how they operate and how users experience their outputs.
Deterministic: A system produces predictable results when the same inputs and conditions are used.
Example: A payroll system calculates an employee's salary using fixed rules and accurate input data.
Probabilistic: A system may involve uncertainty, estimates, or results that cannot be guaranteed.
Example: A sales forecasting system estimates future sales based on historical data and market trends.
A conventional information system may use deterministic processing internally but still produce information that is uncertain or unsuitable for a particular user's needs.
B. Open and Closed Systems
Open system: Interacts with its environment and can adapt to changes.
Example: A business information system that receives updated market data and changes its reports as business requirements evolve.
Closed system: Operates with little or no interaction with its external environment.
In practice, information systems are generally considered open because organisations need them to adapt to new technologies, users, regulations, and business requirements.
C. Programmable and Computerised
Information systems can be implemented using computer programs to automate data processing.
For example, accounting software can automatically calculate expenses, generate financial reports, and store transaction records.
However, an information system is broader than just a computer program. It also includes the processes and activities used to turn data into useful information.
D. Quantitative Information
Information systems should provide concrete, measurable information where appropriate to support decision-making.
For example, a sales report showing revenue of KSh 150,000 provides a measurable basis for comparison and planning.
Quantitative information is particularly useful when users need to compare performance, measure progress, or allocate resources.
4. Qualities of an Effective Information System
An efficient and effective information system should provide:
1. The right information
The information must be relevant, accurate, and useful to the user's needs.
Example: A finance manager receives a report on expenses rather than an unrelated list of customer enquiries.
2. To the right person
Information should reach the person who needs it and is authorised to access it.
Example: A department manager receives reports about their department's performance.
3. At the right time
Information should be available when it is needed for action or decision-making.
Example: Management receives daily sales reports before planning the next day's stock orders.
4. At the right cost
The cost of collecting, processing, storing, and distributing information should be reasonable in relation to its benefits.
Example: A small business uses affordable accounting software instead of investing in an unnecessarily expensive system.
These four principles help ensure that information is useful, timely, accessible to the appropriate people, and economical to produce.
5. Quick Revision Notes
For examination preparation, remember:
- Information system: A system that processes data to produce information.
- Input: Raw data entered into the system.
- Processing: Activities that transform data into information.
- Output: The information produced by the system.
- Deterministic system: Produces predictable results under the same conditions.
- Probabilistic system: Involves uncertainty or outcomes that are not fully predictable.
- Open system: Interacts with its environment and can adapt to change.
- Quantitative information: Measurable information expressed numerically where appropriate.
An effective information system provides the right information, to the right person, at the right time, and at the right cost.
Conclusion
Information systems help organisations transform raw data into meaningful information that supports planning, control, and decision-making.
Their effectiveness depends not only on processing data correctly but also on providing useful information that meets users' needs.
Key takeaway: An information system is valuable when it turns data into useful information that helps people make better decisions.
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