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Information Gap Principle: Who Knows What?

A The Patient Raven guide · Updated 2026-09-15 · 5 min read
Information Gap Principle: Who Knows What?
Quick answerThe information gap principle gives learners a reason to communicate: someone needs information that another person holds. The listener does not have the answer. A blank on a worksheet is not enough. Look at who knows what, then ask what the listener needs to find out.
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What does the information gap principle mean?

The information gap principle gives learners a reason to communicate: someone needs information that another person holds. The listener does not have the answer. A blank on a worksheet is not enough. Look at who knows what, then ask what the listener needs to find out.

The British Council illustrates this with partners holding different missing biography details. It also identifies clarification and rephrasing as communication skills involved. British Council information-gap example.

The useful distinction is between missing information and missing English. A learner may know exactly where a box belongs but need help expressing its location. Another may know the English perfectly but still need to ask where this particular box goes. In planning notes, keep those two questions separate: what fact is unavailable, and what language would help communicate it?

How can the same question do different jobs?

Consider this original classroom example. A fictional office has two rooms, Cedar and Maple. A parcel belongs in Maple. Nobody needs to disclose a real address, workplace or delivery history. The question is always: “Which room is the parcel for?” What changes is the information available to each speaker.

Version What the speakers can see What the answer accomplishes
Shared answer Both learners see “Parcel: Maple” The speaker demonstrates the answer already visible to the listener.
Missing destination A sees “Parcel: Maple”; B has the parcel record with no room listed B obtains a destination that was unavailable on B's record.
Complementary details A knows the room; B knows the recipient, Lina Each obtains a different missing detail for the completed record.

In the shared-answer version, changing the font, adding a speech bubble or removing a written answer line does not hide the destination. Both people still know it. In the second version, the same short question carries a different purpose: B needs the response to complete the record.

Now change only the instruction. Tell both learners to read a complete printed exchange: “Which room is the parcel for?” “Maple.” The listener can already read the answer. That script may serve a rehearsal aim, but its typography does not create missing information. By contrast, providing only the question opening leaves the destination to be discovered.

This is an illustration of the principle, not a tested lesson or a claim that office parcels are the best classroom topic. Its value is that one small change makes the distribution of knowledge visible.

Are questions with known answers a mistake?

No. The British Council calls questions used to check understanding or recall display questions. It distinguishes them from referential questions, where the questioner does not already know the answer. Display questions can have a useful teaching purpose, particularly when checking understanding with beginners. British Council on display questions.

Keep the labels tied to the question's function. “Which room?” is a display question when the teacher knows the room and is checking a learner's response. In our missing-destination version, B asks to obtain information. The words alone do not identify the purpose; the speaker's knowledge matters.

There is no need to relabel every useful classroom exchange as an information gap. A lesson plan can say “check understanding” for one stage and “exchange missing details” for another. Those descriptions are clearer than awarding every pair conversation the same methodological label.

Must information move in both directions?

A gap can involve one person holding a needed fact or partners holding complementary facts. Olenka Bilash's University of Alberta teaching resource illustrates both an unknown card to identify and divided information to exchange. The point is to examine the information each participant holds. Bilash's information-gap guidance.

For the parcel example, we can call the missing-destination version a one-way information flow and the complementary-details version a two-way flow. These labels describe where facts travel. They do not count turns: B may ask a question, request repetition and confirm the room even when A supplies the destination.

Nor does giving each learner one fact establish that their contributions are equally demanding. In this example, copying “Maple” and spelling an unfamiliar recipient's name could be different language demands. Note the intended contribution beside each role instead of assuming that two cards mean identical work.

How does this relate to communicative teaching?

The British Council describes the communicative approach around communicating real meaning. An information gap fits that emphasis by making the response matter to someone who needs it. It is one way to organise meaningful exchange within that broader approach. British Council on the communicative approach.

Our editorial distinction is between a fictional setting and an already-known answer. Cedar and Maple are invented rooms, yet B really lacks the destination within the task. “Real meaning” need not be interpreted as a requirement to collect classmates' private information. Equally, a genuine personal question should not be treated as permission to require disclosure.

For a wider choice of lesson purposes, the ESL speaking activities guide compares the main task families. Choose the purpose before choosing the worksheet.

Is every meaningful exchange an information gap?

In his TeachingEnglish article, Gareth Rees also distinguishes gaps involving experiences and opinions. Finding out another person's preference differs from retrieving a missing factual detail. His examples include sharing experiences and comparing how learners rank jobs. Rees on different gaps.

Return to the parcel. “Which room is listed?” asks for a detail. “Which room would make a better reception area?” asks for a judgement. Neither question becomes better merely because it belongs to a different category. Name the intended exchange accurately, then decide whether it serves this lesson.

Does language support remove the gap?

Support and missing information can coexist. The Bell Foundation recommends clear instructions and additional language scaffolding where needed, particularly for learners new to English or at an early acquisition stage. Bell Foundation guidance.

In our example, “Which room is … for?” supports the question while leaving its answer unknown. A full shared script naming Maple does a different job. That distinction lets you offer help without confusing language difficulty with the information being sought.

Use the information-gap activities collection for practical formats and setup checks. In your own notes, identify what the listener learned from the exchange; do not treat a completed record as proof of lasting language mastery. The speaking classroom hub offers other ways to extend the lesson.

Sources

FAQ

What is the information gap principle in simple terms?

Someone needs a detail that another person has, so communicating supplies something missing. In the parcel example, one learner knows the destination and the other needs it for a record. If both can already see the destination, asking for it serves a different classroom purpose.

Are display questions bad teaching?

No. The British Council describes display questions as useful for checking understanding or recall. The distinction concerns their purpose: the questioner already knows the answer. A referential question seeks an answer the questioner does not know. A lesson can include both without calling every exchange an information gap.

Can an information gap work in one direction?

Yes. One person can hold information that another needs; alternatively, partners can hold complementary details. In our parcel example, these are one-way and two-way flows of information. The labels do not prescribe how many questions or clarification turns occur, or promise equal language demands for both roles.

Is asking for an opinion the same kind of gap?

Gareth Rees's TeachingEnglish article distinguishes opinion and experience gaps as well as information gaps. Asking which room is listed seeks a factual detail; asking which room someone prefers seeks a judgement. Both can give someone a reason to respond, but they ask learners to do different things.

Can beginners receive sentence starters during an information gap?

Language support need not reveal the missing answer. The Bell Foundation recommends scaffolding where learners need it. In the parcel example, a question starter helps someone ask about the room while keeping its name unknown. A shared script containing that name instead provides the answer before the exchange.