AccountancyCBSE Class 12 · Overview of Computerised Accounting System

Computerised Accounting System Class 12: Features, Advantages and Limitations

Updated 15 October 2026 · Fact-checked

A Computerised Accounting System (CAS) records and processes transactions with hardware and software to produce day books, ledgers, trial balance and financial statements. Its salient features are simplicity and integration, transparency and control, accuracy and speed, scalability and reliability. Its main limitations are costly obsolescence, risk of data loss, hacking and viruses, and inability to produce unprogrammed reports.

Notice the two sides: five features that make CAS fast and reliable, and five limitations such as data loss, hacking and errors of principle.

Illustration drawn for QuestionBuddy.

Understand Features, Advantages and Limitations of CAS

Components (five). Procedure (ordered steps), Data (raw facts: account, code, date, amount), People (users), Hardware (computer, peripherals, network) and Software (system and accounting software).

Salient features of CAS.
1. Simple and integrated: sales, purchases, inventory, finance and payroll are linked; one entry updates all related records.
2. Transparency and control: day-to-day information is available with control over who sees what.
3. Accuracy and speed: templates and data-entry screens make entry quick; reports are instant and arithmetic is error-free.
4. Scalability: handles growing volumes of data without changing the system.
5. Reliability: critical information is accurate, controlled and secure.

Advantages. Timely reports in the desired format; efficient record keeping; effective control through exception reports; economy in processing; confidentiality through passwords and user rights; up-to-date information on demand.

Limitations.
1. Cost and obsolescence: hardware and software become outdated quickly and need fresh investment.
2. Data loss or corruption: power failure, disk crash or careless handling can destroy records unless backups are kept.
3. Security risks: hacking, viruses and unauthorised access.
4. Unprogrammed reports: reports not designed in the software cannot be produced without changes.
5. Errors of principle remain: the computer processes what it is given; a wrong account chosen gives wrong results quickly.

Manual vs computerised. Identification of transactions is done by people in both; recording is by voucher entry in CAS; classification, summarisation and reports are automatic in CAS, while manual systems post, total and prepare them by hand.

Features, Advantages and Limitations of CAS: key facts

Five components: Procedure, Data, People, Hardware, Software; PDPHS.
Five salient features: Simple and integrated; transparency and control; accuracy and speed; scalability; reliability
Four data elements of a transaction: Account name, account code, date, amount

How to answer Features, Advantages and Limitations of CAS questions

CAS theory answers score on precise feature names and one-line explanations; case questions name the feature from a clue.

1Spot the clue in the case: speed, integration, scale, control, reliability, or a risk.
2Name the feature or limitation exactly as the textbook calls it.
3Explain it in one line with a business example.
4For 'differences', use the same basis on both sides (recording, classification, reports, speed, accuracy).
5For 4-mark answers give four distinct points.
6Avoid vague points like 'computers are good'.

Features, Advantages and Limitations of CAS in real life

The idea, met in an everyday situation. Answer the question in your own words, then compare with the model answer. The one-line hook is what to remember.

Integration and scalability

Suppose a small chain of three pharmacies keeps manual books. When it opens a fourth store, the accountant must post every sale to sales, stock and debtors' ledgers separately, and month-end statements take ten days. The owner considers moving to a computerised accounting package.

Which features of CAS would solve these two problems? Explain.

Try it first, then show the solutionSolution

Separate posting to several ledgers: solved by integration, as one voucher updates sales, stock and debtors together.
Growing volume with more stores: solved by scalability, as the same system handles more data.
Slow statements: solved by speed, as reports are generated instantly.

Answer: Simplicity and integration (one entry updates all linked records), scalability (the system grows with new stores) and speed (instant reports) address the owner's problems, though he must plan backups and passwords to manage the new risks.

Memory hook: Enter once, update everywhere, at any scale.

Tricks to remember Features, Advantages and Limitations of CAS

Short memory aids. Say each one aloud once, then use it on a question the same day.

SITAR for features
Simple-integrated, Transparency, Accuracy-speed (A), Reliability, and scalability (S): 'SITAR + S'.
Use it when: Listing features.
CODE for limitations
Cost of obsolescence, Outages and data loss, Dangers of hacking and viruses, Exceptions (unprogrammed reports).
Use it when: Listing limitations.
PDPHS
Procedure, Data, People, Hardware, Software: 'Please Do Pass Higher Secondary'.
Use it when: Components.

Features, Advantages and Limitations of CAS: solved examples

Ordered from board level to HOTS. Try each one before you open the solution.

Example 1: Which feature? · 1 mark · MCQBoard level

A company's accounting software lets it handle ten times more transactions after opening new branches, without replacing the system. This feature of CAS is:
(a) transparency
(b) scalability
(c) reliability
(d) integration

Try it first, then show the solutionSolution

Handling growing volumes without changing the system is scalability.

Answer: (b) scalability

Example 2: Three features · 3 marks · Short answerBoard level

Explain any three salient features of a Computerised Accounting System. (3 marks)

Try it first, then show the solutionSolution

Simple and integrated: business functions are linked, so one entry updates all related records.
Accuracy and speed: data-entry screens and templates make recording quick; reports are generated instantly and correctly.
Reliability: critical financial information is accurate, controlled and secure.

Answer: Any three features, each named and explained in one line.

Example 3: Limitations with examples · 4 marks · Short answerHarder board level

State any four limitations of a Computerised Accounting System. (4 marks)

Try it first, then show the solutionSolution

Fast obsolescence of hardware and software requires repeated investment.
Data may be lost or corrupted by power failure or disk crash without backups.
Hacking and viruses threaten security and confidentiality.
Reports that were not programmed cannot be generated without modifying the software.

Answer: Four limitations as listed, each with one line of explanation.

Example 4: Manual vs computerised · 3 marks · Short answerHarder board level

Distinguish between manual and computerised accounting on the basis of (i) recording, (ii) classification and (iii) preparation of reports. (3 marks)

Try it first, then show the solutionSolution

(i) Manual: entries in books of original entry; CAS: data entered through vouchers and stored in a database.
(ii) Manual: posting to ledgers by hand; CAS: classification is automatic, no separate posting.
(iii) Manual: trial balance and statements prepared by hand; CAS: generated instantly by the software.

Answer: As listed for each basis.

Example 5: Errors of principle · 1 mark · Assertion-reasonHOTS / competency

Assertion (A): A Computerised Accounting System cannot detect a transaction posted to the wrong account head.
Reason (R): The system processes data exactly as entered; the user must identify and classify transactions correctly.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.

Try it first, then show the solutionSolution

Arithmetic is automatic, but judgement about the right account is human. R explains A.

Answer: (a) Both A and R are true, and R is the correct explanation of A.

Where students lose marks in Features, Advantages and Limitations of CAS

The slips examiners see most often, and what to write instead.

Mistake: Mixing features with advantages
Using the same words for both questions.
Wrong working
Feature: 'saves money'.
Right working
Feature: 'scalability'; advantage: 'economy in processing'.
Do this: Use textbook names for each list.
Usually costs: 1 mark.
Mistake: Writing one-word points
Hurrying.
Wrong working
'Speed.'
Right working
'Accuracy and speed: reports are generated instantly and without arithmetic errors.'
Do this: Name plus one line.
Usually costs: 1/2 mark per point.
Mistake: Claiming CAS removes all errors
Overstating accuracy.
Wrong working
'CAS has no errors.'
Right working
'CAS removes arithmetic errors; errors of principle remain.'
Do this: Be precise.
Usually costs: 1 mark.
Mistake: Leaving out 'procedure' among components
Remembering only hardware and software.
Wrong working
Components: hardware, software, people.
Right working
Procedure, data, people, hardware, software.
Do this: Use PDPHS.
Usually costs: 1 mark.

Exam tips

Use the exact feature names: they are what the marking scheme looks for.
In 'distinguish' questions, write the basis in the first column.
Give a business example where possible.
Features, advantages and limitations are the most repeated CAS questions (1, 3 and 4 marks) in Part B Option II.

Practice questions on Features, Advantages and Limitations of CAS

Write each answer on paper first. Open the hint only if you are stuck, and the answer only when you have finished.

Q1 · 1 mark · MCQBoard level
Which of the following is a component of a Computerised Accounting System?
(a) Procedure
(b) Journal proper
(c) Ledger folio
(d) Trial balance
Hint
PDPHS.
Answer
(a) Procedure
Q2 · 1 mark · MCQBoard level
A limitation of CAS is:
(a) instant reports
(b) fast obsolescence of technology
(c) integration of functions
(d) scalability
Hint
A cost, not a benefit.
Answer
(b) fast obsolescence of technology
Q3 · 3 marks · Short answerHarder board level
Name the five components of a Computerised Accounting System and explain any two. (3 marks)
Hint
PDPHS.
Answer
Procedure, data, people, hardware, software. Procedure: the logical sequence of actions to perform a task (such as entering vouchers and generating reports). Data: raw facts such as account name, code, date and amount, processed into information.
Q4 · 3 marks · Short answerHarder board level
State any three advantages of a Computerised Accounting System. (3 marks)
Hint
Timely, efficient, control, economy, confidentiality.
Answer
Timely reports in the desired format; efficient record keeping with easy retrieval; effective control through instant exception reports (any three of these or economy in processing and confidentiality of data).
Q5 · 3 marks · Short answerHarder board level
Identify the feature of CAS in each: (i) management sees up-to-date figures daily, but each user sees only what he is permitted to; (ii) a single sales voucher updates sales, stock and the customer's account. (3 marks)
Hint
Control; integration.
Answer
(i) Transparency and control. (ii) Simple and integrated.
Q6 · 1 mark · Assertion-reasonHarder board level
Assertion (A): Computerised accounting removes the need for posting transactions to ledger accounts by hand.
Reason (R): Classification and summarisation are done automatically from the stored data.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Hint
What does the software do after entry?
Answer
(a) Both A and R are true, and R is the correct explanation of A.
Q7 · 4 marks · Short answerHOTS / competency
Suppose a firm's office loses power during month-end processing, and the hard disk is damaged. Which limitation of CAS does this show, and suggest two safeguards. (4 marks)
Hint
Data loss.
Answer
It shows the risk of data loss or corruption. Safeguards: regular backups stored separately (or on a secure remote server), and an uninterruptible power supply; access controls and antivirus also protect data integrity.
Q8 · 3 marks · Short answerHOTS / competency
A small shop owner says, 'With computerised accounting, I don't need an accountant who understands accounting.' Evaluate this statement. (3 marks)
Hint
Who identifies and classifies?
Answer
The statement is wrong. Software automates posting, totals and reports, but people must still identify transactions, choose the correct account heads and vouchers, and interpret the reports. Errors of principle are processed as entered, so accounting knowledge remains essential.

Test your recall

Answer in your head or on paper first, then open the card. Pulling an answer out of memory makes it stick far better than re-reading.

1.Name the five components of CAS.Show answer
Procedure, data, people, hardware and software.
2.Which feature means one entry updates all related records?Show answer
Simple and integrated.
3.Name two limitations of CAS.Show answer
Fast obsolescence and risk of data loss (also hacking/viruses, unprogrammed reports).
4.Name the four data elements of a transaction.Show answer
Account name, account code, date and amount.
5.Does CAS remove errors of principle?Show answer
No; only arithmetic and posting errors.

Features, Advantages and Limitations of CAS: frequently asked questions

What is a Computerised Accounting System in Class 12?

A system that uses hardware and software to record accounting transactions and produce reports such as day books, ledgers, trial balance and financial statements.

What are the salient features of CAS?

Simple and integrated, transparency and control, accuracy and speed, scalability and reliability.

What are the main limitations of CAS?

Cost of fast obsolescence, data loss or corruption, security threats like hacking and viruses, and inability to produce unprogrammed reports.

Is Database Management System part of the 2026-27 syllabus?

No. The NCERT chapter on DBMS for accounting was dropped and is not assessed.