Commercial StudiesICSE Class 9 · Communication in Commercial Organisations

Methods of Communication: Business Letter, E-mail, Conference Calling and Social Media (ICSE Class 9 Commercial Studies)

Updated 17 October 2026 · Fact-checked

A business letter is a formal written message on paper that gives a permanent record; e-mail is a fast, cheap electronic message with attachments; conference calling (audio or video) lets three or more people at different places talk together, with video adding sight; social media are internet platforms for sharing content and two-way contact with customers.

Match each method to its icon and key strength: letter gives proof, e-mail is fast, conference calls link places, social media allows two-way contact.

Illustration drawn for QuestionBuddy.

Understand Methods of Communication: Business Letter, E-mail, Conference Calling and Social Media

Business letter. Written message on paper, usually on letterhead, sent by post, courier or hand. Format: sender's address, date, receiver's address, subject, salutation, body, complimentary close, signature. Uses: orders, quotations, appointment letters, legal notices, complaints. Features: permanent written record; legal evidence; formal; slow and costly compared with e-mail.

E-mail. Electronic mail, with or without attachments, over the internet from one address to another. Uses: day-to-day messages, invoices, reports, quotations, circulars, customer support. Features: very fast; cheap; many recipients at once; electronic record; attachments; needs internet; care against spam and fraud.

Conference calling. Three or more people at different places talk at the same time through a telephone or internet connection.

Audio conference: hear and speak but cannot see. Example: a sales manager's 15-minute morning call with five towns.
Video conference: see and hear through cameras, share documents. Example: directors in Mumbai, Bengaluru and Singapore holding a board meeting.

Role: saves travel time and cost; quick decisions; links distant branches; supports work from home and online interviews. Limits: depends on network; lacks personal touch.

Social media. Internet-based platforms allowing users to create, share and exchange content and interact in online communities.
Use by firms: promote products at low cost to a large audience; two-way contact, answering queries, feedback and reviews; building brand image and loyalty; recruitment through professional sites; internal groups. Care: negative comments spread fast; fake news and fraud; data privacy; reply quickly and politely.

Choosing a method.

Need	Best method
Formal record, legal notice	letter
Quick message with a document	e-mail
Board meeting across cities	video conference
Daily briefing by voice	audio conference
Promotion and feedback	social media

Cost illustration. Five managers each spending Rs 6,000 on travel cost Rs 30,000; a video conference replaces this.

Draw-and-label checklist. A table of the four methods with speed, cost, record and personal touch.

Methods of Communication: Business Letter, E-mail, Conference Calling and Social Media: key facts

Four methods: Letter
E-mail
Conference calling (audio, video)
Social media; As in the syllabus.
Conference types: Audio: hear only | Video: see and hear, share documents; Three or more people.
Letter format: Sender address
Date
Receiver address
Subject
Salutation
Body
Complimentary close
Signature; Standard order.

Methods of Communication: Business Letter, E-mail, Conference Calling and Social Media 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.

Parent-teacher meeting online

Suppose a school holds a meeting where parents from different towns see the principal on screen and hear each other.

Which method is this and what are two benefits?

Try it first, then show the solutionSolution

It is a video conference.
It saves travel time and cost, and lets everyone see and hear each other.

Answer: Video conference; saves travel and gives sight and sound.

Memory hook: Meet without moving.

A legal notice

Suppose a supplier wants a formal record that his payment reminder was sent and received.

Which method is best?

Try it first, then show the solutionSolution

A business letter gives a permanent written record that can be used as legal evidence.

Answer: A business letter.

Memory hook: Paper proves.

Tricks to remember Methods of Communication: Business Letter, E-mail, Conference Calling and Social Media

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

L-E-C-S
Letter, E-mail, Conference, Social media.
Use it when: Four methods.
Audio hears, video sees
A for ears; V for view.
Use it when: Conference types.
Letter = record, e-mail = speed
One-line difference.
Use it when: Comparison.

Methods of Communication: Business Letter, E-mail, Conference Calling and Social Media: solved examples

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

Example 1: Match need to method · 4 marks · Short answerBoard level

Choose the best method for each need: (a) a legal notice to a defaulter, (b) a daily 10-minute voice briefing to salespeople in six towns, (c) a quick quotation with a price list attached, (d) answering customer reviews publicly.

Try it first, then show the solutionSolution

(a) Business letter (1 mark).
(b) Audio conference (1 mark).
(c) E-mail (1 mark).
(d) Social media (1 mark).

Answer: (a) Letter. (b) Audio conference. (c) E-mail. (d) Social media.

Example 2: Letter versus e-mail · 4 marks · Short answerHarder board level

Distinguish between a business letter and an e-mail on four points.

Try it first, then show the solutionSolution

Medium: paper delivered by post or courier versus electronic over the internet (1 mark).
Speed: slow versus very fast (1 mark).
Cost: costlier versus cheap (1 mark).
Record: permanent paper record usable as legal evidence versus an electronic record (1 mark).

Answer: Medium, speed, cost and record.

Example 3: Hiring cost saved · 3 marks · Case-basedHOTS / competency

A firm interviews 8 candidates from other cities. Each would have spent Rs 3,500 on travel. An online video interview platform costs the firm Rs 6,000 for the day. (a) Find the total travel cost avoided. (b) Find the net saving. (c) Name one drawback of video interviews.

Try it first, then show the solutionSolution

(a) 8 × 3,500 = Rs 28,000 (1 mark).
(b) 28,000 − 6,000 = Rs 22,000 (1 mark).
(c) Network problems or lack of personal touch (1 mark).

Answer: (a) Rs 28,000. (b) Rs 22,000. (c) Network dependence or less personal touch.

Example 4: Social media strategy · 5 marks · Short answerHarder board level

Suppose a bakery posts offers on a social media page and customers comment, one complaining about a late delivery. State three benefits of social media to the bakery and two precautions.

Try it first, then show the solutionSolution

Promotes offers to a large audience at low cost (1 mark).
Two-way contact: quick answers to queries and complaints (1 mark).
Builds brand image and gets feedback and reviews (1 mark).
Precaution: reply quickly and politely, since negative comments spread fast (1 mark).
Precaution: guard customers' data privacy and watch for fraud (1 mark).

Answer: Low-cost promotion, two-way contact, brand image; polite quick replies and privacy.

Example 5: Audio conference use · 2 marks · Short answerBoard level

Explain audio conference calling with an example, and one limitation.

Try it first, then show the solutionSolution

Three or more people at different places hear and speak but cannot see (1 mark; example: sales manager's morning call with five towns).
Limitation: no sight, and it depends on a good network (1 mark).

Answer: Hear and speak only; for example a daily sales call; needs a network.

Where students lose marks in Methods of Communication: Business Letter, E-mail, Conference Calling and Social Media

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

Mistake: Saying a video conference does not allow discussion
Participants see, hear and share documents.
Wrong working
Video conferences are one-way.
Right working
Video conferences are two-way for three or more people.
Do this: Conference = people talk together.
Usually costs: 1 mark.
Mistake: Writing that e-mail has no record
It keeps an electronic record.
Do this: Record: letter paper, e-mail electronic.
Usually costs: 1 mark.
Mistake: Listing only benefits of social media
The syllabus also notes care needed.
Do this: Add a precaution.
Usually costs: 1 mark.

Exam tips

Give meaning, example and one limitation for each method.
Use a table for choosing a method.
Remember the letter format order.
State cost saving with working.

Practice questions on Methods of Communication: Business Letter, E-mail, Conference Calling and Social Media

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
A message sent over the internet with attachments from one address to another is a:
(a) letter (b) conference call (c) e-mail (d) telegram
Hint
Electronic mail.
Answer
(c) e-mail.
Q2 · 3 marks · Short answerBoard level
Name two advantages and one limitation of e-mail.
Hint
Fast, cheap; spam.
Answer
Advantages: very fast and cheap; can reach many people with attachments. Limitation: needs internet access and care against spam and fraud.
Q3 · 4 marks · Short answerHarder board level
A firm has 10 branches and the head office often sends instructions. Compare letters, e-mail and audio conferences for this purpose.
Hint
Speed, cost, record, discussion.
Answer
Letters give a record but are slow and costly for 10 branches; e-mail is fast and cheap and keeps an electronic record; an audio conference lets all branches discuss at once but leaves no written record unless minutes are kept. E-mail with an occasional audio conference suits best.
Q4 · 2 marks · Short answerHarder board level
Explain how a video conference is better than an audio conference for an online interview.
Hint
Sight.
Answer
A video conference lets the interviewer see the candidate and share documents as well as hear, giving a better impression than hearing alone.
Q5 · 3 marks · Case-basedHOTS / competency
Read and answer.
Suppose a company posts a new product video on a social platform, which gets 8,000 views and 2% of viewers send enquiries.
(a) How many enquiries? (1)
(b) Name two benefits of using social media. (2)
Hint
2% of 8,000.
Answer
(a) 8,000 × 2% = 160 enquiries. (b) Low-cost promotion to a large audience and quick two-way contact with customers.

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.What is a conference call?Show answer
Three or more people talking together at different places.
2.Which has a permanent paper record?Show answer
A business letter.
3.Can e-mail carry attachments?Show answer
Yes.
4.What is social media?Show answer
Internet platforms for sharing content and interaction.
5.Name a video conference benefit.Show answer
Saves travel time and cost.

Methods of Communication: Business Letter, E-mail, Conference Calling and Social Media: frequently asked questions

Is a letter still used?

Yes, for formal records and legal notices.

Can an audio conference share slides?

Not as a video conference does.

Who uses professional networking sites?

Firms use them for recruitment.

Why do firms reply quickly on social media?

Negative comments spread fast.