Performance Management · Management information systems

Types of Information Systems: TPS, DSS, EIS and Expert Systems

Updated 11 October 2026 · Fact-checked

Information systems are grouped by the job they do. A transaction processing system (TPS) records routine data. A decision support system (DSS) helps managers analyse semi-structured problems. An executive information system (EIS) gives senior managers summarised, mostly external and strategic information. An expert system copies specialist judgement using rules.

Understand Types of Information Systems

An information system takes in data, processes it and produces information for people to use. Different managers need different information. So organisations run different types of system, and each type fits a level of management.

A transaction processing system (TPS) captures and stores the day-to-day events of the business. Examples are sales invoices, payroll, purchase orders and cash receipts. Data is detailed, routine and mostly internal. A TPS mainly serves operational staff. It is also the base that feeds the other systems.

A decision support system (DSS) helps middle managers with problems that are only partly structured. It lets the user ask "what if?" questions, build models and test options. It draws on TPS data and sometimes external data. An example is a model that tests how a price change affects profit.

An executive information system (EIS) serves senior managers who make strategic decisions. It gives summarised, easy-to-read information, often with drill-down to detail. It mixes internal and external data, such as competitor, market and economic data. An example is a dashboard showing group profit, market share and key performance indicators.

An expert system holds the knowledge of a human specialist as a knowledge base and a set of rules. An inference engine applies the rules to the facts a user enters. It then gives advice or a decision. Examples are loan approval screening or tax and technical queries. It suits well-defined problems where rules can be written down.

Key rules to remember

TPS: Operational level | structured, routine | detailed internal data; Records transactions. Feeds all other systems.
DSS: Tactical level | semi-structured | models, what-if analysis; Supports the decision. The manager still decides.
EIS: Strategic level | unstructured | summarised, internal and external data, drill-down; Dashboard style. Focus on key indicators and trends.
Expert system: Knowledge base + rules + inference engine + user interface; Imitates an expert in a narrow, rule-based area.

How to solve Types of Information Systems questions

Use this method for any question that asks you to identify, describe or compare types of information system.

1Read the scenario and find who uses the information: operational staff, middle managers or senior managers.
2Decide how structured the problem is: routine, partly structured or unstructured.
3Check the data: detailed or summarised, internal only or internal and external.
4Match to the system: TPS for routine records, DSS for analysis and what-if, EIS for strategic summaries, expert system for rule-based specialist advice.
5Give the reason for your choice using words from the scenario, not just the label.
6If asked to compare, state at least one clear difference for each point: user, data, purpose and output.
7If asked for benefits or limits, link them to the organisation in the question.

Quickest way: User and problem shortcut

When to use it: Use this in Section A or B objective questions when you must name a system in under a minute.

Spot the user. Clerk points to TPS. Senior director points to EIS.
Look for the keywords. "What if" or "model" points to DSS. "Rules" or "replaces a specialist" points to expert system.
Look for "records" or "processes every sale". That is TPS.
Reject options that mismatch the level of management.
Pick the remaining option and move on.

Common mistakes in Types of Information Systems

Saying a DSS makes the decision.
The word "support" is overlooked.
Fix: State that a DSS helps the manager analyse options. The manager makes the decision.
Treating an EIS as a detailed data store.
Students confuse it with a TPS.
Fix: Remember an EIS shows summarised key information, with drill-down only when needed.
Saying a TPS gives strategic information.
Students see that it holds all the data.
Fix: A TPS holds raw, detailed data. Other systems turn it into higher-level information.
Using an expert system for unstructured strategic choices.
The word "expert" suggests it can judge anything.
Fix: An expert system works only where rules can be written down. Open-ended strategy is not suitable.
Listing definitions without applying them to the scenario.
Students recall the notes and stop.
Fix: Tie each point to the business in the question. Name the user, the data and the decision.

Worked examples

Example 1

A retail chain has a system that records every till sale and updates stock automatically. Store managers use a separate tool to test how changing promotion prices would affect weekly profit. Directors view a screen showing group sales, market share and competitor prices. Identify the type of each system.

Show the solution

The till and stock system records routine events in detail. It is a TPS.
The tool for testing price changes allows what-if analysis on a semi-structured problem for managers. It is a DSS.
The directors' screen shows summarised data, including external data such as market share and competitor prices, for strategic use. It is an EIS.
Note that the TPS data probably feeds the DSS and EIS.

Answer: Till and stock system: TPS. Price testing tool: DSS. Directors' screen: EIS.

Example 2

A bank uses software that asks loan applicants set questions and applies stored lending rules to approve or refuse small loans. Explain what type of system this is and one advantage and one limitation.

Show the solution

The system applies stored rules to user inputs to give a decision. That is an expert system.
It has a knowledge base of lending rules and an inference engine that applies them.
Advantage: decisions are fast and consistent, and staff time is saved.
Limitation: it cannot handle unusual cases outside its rules, and the rules need regular updating.

Answer: It is an expert system. It gives fast, consistent decisions but cannot judge cases outside its rules and needs its rules kept up to date.

Exam tips

Always link the system to the management level that uses it. Examiners reward this link.
In comparison questions, use the same headings for each system: user, data, purpose, output.
For DSS, write "supports" and "what-if". For EIS, write "summarised", "external" and "strategic".
In objective questions, eliminate options by user level first.
In written answers, use the scenario's own business details in every point.

Practice questions from Management information systems

Types of Information Systems in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

Types of Information Systems: frequently asked questions

What is the difference between a TPS, DSS and EIS?

A TPS records routine transactions for operational staff. A DSS lets middle managers analyse semi-structured problems with models and what-if tests. An EIS gives senior managers summarised internal and external information for strategic decisions.

Can you give an example of an executive information system for ACCA PM?

A dashboard showing group profit, market share, key performance indicators and competitor data is a good example. Directors can drill down into detail if a figure looks wrong.

Is an expert system the same as a decision support system?

No. A DSS helps a manager analyse a problem, and the manager decides. An expert system applies stored rules to give advice or a decision in a narrow, well-defined area.

Do these systems work separately?

Usually not. A TPS captures the data. A DSS and an EIS draw on that data, and often on external sources, to give higher-level information.