Business and Technology · Communicating in business

Formal and Informal Communication Channels in Business

Updated 11 October 2026 · Fact-checked

Formal communication follows the official structure: downward (instructions), upward (reports and feedback), lateral (between peers) and diagonal (across levels and departments). Informal communication, called the grapevine, runs through personal relationships outside the structure. To answer exam questions, identify who sends to whom and whether the route is official.

Understand Formal and Informal Communication Channels

Every organisation needs information to move between people. Communication channels are the routes it takes. In your exam, you must tell formal routes from informal ones and name the direction of flow.

Formal communication follows the official structure, such as the organisation chart and reporting lines. It is usually planned, documented and recorded. Examples are a policy memo, a board report, a minutes-recorded meeting and an approved budget.

Formal communication flows in four directions:

Downward: from senior to junior, along the chain of command. Examples: instructions, targets, policies, procedures, performance feedback.
Upward: from junior to senior. Examples: progress reports, variance reports, suggestions, complaints, requests for approval.
Lateral (horizontal): between people or departments at the same level. Examples: sales telling production about expected orders, coordination between team leaders.
Diagonal (cross-wise): between people at different levels in different departments or lines. Example: an internal auditor contacting a junior purchasing clerk directly. It saves time but can bypass line managers.

Informal communication is not set by the structure. It grows from friendships, shared interests and social contact. The best-known form is the grapevine: the informal network through which rumour, gossip and unofficial news travels. It can be very fast and often reaches many people quickly.

The grapevine has advantages: it is quick, it shows how staff really feel, and it can support the formal system and team spirit. Its disadvantages: information may be inaccurate or distorted, rumours can damage morale, and managers cannot control it. Managers cannot remove it. They can reduce harmful rumours by giving clear, timely formal communication.

Formal channels give accuracy, accountability and a record, but can be slow and rigid. Informal channels are fast and flexible but unreliable. Good organisations use both.

Key formulas to remember

Downward communication: Senior → Junior (along the chain of command); Instructions, policies, targets, feedback.
Upward communication: Junior → Senior (along the chain of command); Reports, suggestions, complaints, requests.
Lateral communication: Peer ↔ Peer (same level); Coordination between colleagues or departments.
Diagonal communication: Different level + different department/function; Crosses both levels and lines, so it may bypass the chain of command.
Formal vs informal test: Formal = follows official structure; Informal = follows personal relationships; Grapevine is the informal channel.

How to solve Formal and Informal Communication Channels questions

Use this method for any scenario or definition question on communication channels.

1Read the scenario and find the sender and the receiver.
2Decide if the route follows the official structure or personal contacts. If personal and unofficial, it is informal or grapevine.
3If formal, compare the levels. Higher to lower is downward. Lower to higher is upward.
4If both are at the same level, it is lateral.
5If they are at different levels and in different departments, it is diagonal.
6Check the content. Instructions suggest downward. Reports and feedback suggest upward.
7Check the question wording: is it asking for the direction, an advantage, a disadvantage or a definition? Answer exactly that.
8For multiple response items, select exactly the stated number of options.

Quickest way: Sender, receiver, official or not

When to use it: Use this for one- and two-mark objective test questions where you must name a channel or direction.

Ask: official route or personal chat? Personal means grapevine.
If official, ask: is the receiver higher, lower or equal?
If the receiver is in a different department and at a different level, choose diagonal.
Eliminate options that describe a different direction, then pick the best fit.

Common mistakes in Formal and Informal Communication Channels

Calling lateral communication diagonal, or the reverse.
Both cross departments, so students overlook the level.
Fix: Check levels. Same level is lateral. Different level and different department is diagonal.
Treating the grapevine as always false or harmful.
Students link it only to rumours.
Fix: Remember it is fast and shows staff feelings. State both advantages and disadvantages.
Assuming informal communication is not used by managers.
Students think informal means unimportant.
Fix: Informal channels exist at all levels, and managers may use them to gauge opinion.
Confusing upward with downward when feedback is mentioned.
Feedback can go either way.
Fix: Look at who gives it. A manager giving appraisal feedback is downward. Staff giving feedback on management is upward.
Saying formal communication is always written.
Students link formal with documents.
Fix: Formal means official. A scheduled meeting or an instruction given verbally through the line manager is still formal.

Worked examples

Example 1

A junior accounts clerk emails the head of a different department, who is two levels above the clerk, to ask for data. Which type of communication is this?

Show the solution

The sender is a clerk and the receiver is a senior manager, so the levels differ.
The receiver is in a different department, so it is not within the clerk's own line.
It crosses both levels and departments, so it is neither upward within the line nor lateral.

Answer: Diagonal communication.

Example 2

Explain one advantage and one disadvantage of the grapevine for a manager.

Show the solution

Define it: the informal network of personal contacts through which unofficial information passes.
Advantage: it is very fast, so news reaches staff quickly and managers can learn how employees feel.
Disadvantage: it can carry inaccurate or distorted information, which may harm morale and cannot be controlled.
Add a link: managers can reduce harmful rumours by giving clear and timely formal communication.

Answer: Advantage: speed and insight into staff feelings. Disadvantage: rumours and inaccuracy that are hard to control.

Exam tips

Always name the direction using the exact terms: upward, downward, lateral, diagonal.
Look for level and department clues in the scenario. They decide between lateral and diagonal.
Grapevine questions often ask for advantages or disadvantages, so learn both sides.
On multiple response questions, read how many answers are required before selecting.
Link channel problems to causes such as delay or distortion if the question asks for consequences.

Practice questions from Communicating in business

Formal and Informal Communication Channels in other exams

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

CMA FoundationFormal and Informal Communication

Formal and Informal Communication Channels: frequently asked questions

What is the difference between formal and informal communication?

Formal communication follows the official structure and is usually planned and recorded. Informal communication follows personal relationships and is not controlled by the structure. The grapevine is the main informal channel.

What is the difference between upward and downward communication?

Downward communication goes from senior to junior, such as instructions and targets. Upward communication goes from junior to senior, such as reports and suggestions.

What is the grapevine in organisational communication?

It is the informal network through which unofficial information and rumours pass between employees. It is fast but can be inaccurate.

Is diagonal communication formal?

Usually yes, when it is an official, work-related contact across levels and departments. It can save time but may bypass the chain of command.