IELTS Task 1 Process Vocabulary: Describe Every Stage

An IELTS Academic Writing Task 1 diagram shows this bottle-recycling process:

Used glass bottles are placed in street bins. A truck takes them to a plant. There, they are sorted by color, washed, and crushed. The glass pieces are heated until they melt. The liquid glass is poured into molds. The new bottles cool, are filled with juice, and are delivered to shops.

A weak response might begin like this:

First, people responsibly donate bottles so that the factory can create better products. Consequently, the bottles are sorted. The subsequent washing causes the glass to be crushed, and it culminates in delivery.

The grammar is mostly possible. The reporting is not accurate. The diagram does not show anyone's purpose, whether the products are better, or whether washing causes crushing. It shows a sequence. Your lexical decision is therefore simple but strict: Does the visual show time, cause, gradual removal, or the end point of a process?

That decision matters more than choosing an impressive verb. For wider practice with this task, use the IELTS vocabulary hub. You can also explore the other test guides under Exam English.

IELTS Academic Writing has two tasks in 60 minutes. Task 1 requires at least 150 words, and the official guidance recommends spending no more than 20 minutes on it. For a process, you may need to describe stages, a procedure, a sequence of events, or how something works. Your job is to select and report the main features and give an overview in an academic or neutral style.

First decide what the arrows mean

An arrow often means “next.” It does not always mean “because of.” Keep four relationships separate:

• Time: one stage comes after another.
• Cause: one stage produces a result.
• Development: a series builds toward a final point.
• Removal: something is withdrawn gradually until it is no longer used.

The assigned vocabulary sits on these four lines. Some words overlap, but they do not make the same claim.

Subsequent is about time, not cause

Subsequent means later in time: the subsequent stage or in the subsequent step. Consequent points to a result or effect. A stage can be subsequent without being consequent.

In the bottle process, washing is subsequent to sorting. The diagram also places crushing after washing. It does not prove that washing brings about crushing. Write:

In the subsequent stage, the sorted bottles are washed and then crushed.

Do not write consequently unless the visual supports a causal link.

Culminate in marks the end point of a developing process

Culminate in presents an event or outcome as the final point that a process or series built toward. The usual frame is process + culminates in + outcome. It is more focused than the neutral end with, though both may fit the same facts.

The recycling process culminates in the delivery of filled bottles to shops.

This does not claim that delivery is good, dramatic, or the only effect. It simply makes delivery the end point of the described series. Do not use culminate in for any isolated cause and effect. A ten-second power cut can result in a stopped machine, but it does not form a developing series that culminates in that result.

Phase out requires gradual removal

Phase out means stop using, providing, or producing something gradually, in stages. Eliminate only says that something is removed; it does not build in gradualness.

Our bottle diagram contains no phase-out. Nothing is shown being used less and less until it disappears. If a different diagram showed a factory reducing coal use by 25% each year until reaching zero, coal is phased out over four years would be licensed. If a material disappeared in one step, eliminated or removed would fit better.

This is a useful rejection rule: do not use phase out merely because an item is absent from the final picture.

Keep causal direction visible

Three phrases can report causation, but their grammar points in different directions.

Bring about and cause overlap broadly. Bring about is separable: bring the change about and bring it about. It does not itself say that the cause was deliberate, sudden, or the only cause.

Stem from and result from also overlap. Both put the result first and its source after from. Stem from often directs attention to an underlying origin, but it does not prove that the named source is the only cause.

Give rise to and result in put the cause first. Give rise to is formal and takes a noun phrase: gives rise to liquid glass. It asserts causation; it is not a hedge. It cannot be used merely because one stage follows another.

The diagram explicitly says that the pieces are heated until they melt. That wording licenses a causal relation:

Heating brings about a change from solid pieces to liquid glass.

The liquid state stems from heating the crushed glass.

Heating the pieces gives rise to liquid glass, which is then poured into molds.

These are grammatical alternatives, not three different scientific claims. In a short Task 1 response, one clear version is enough.

Select stages before you write

For the bottle process, the stages can be grouped like this:

1. Collection: bottles go from street bins to the plant.
2. Preparation: they are sorted, washed, and crushed.
3. Re-formation: the pieces are heated, poured into molds, and cooled.
4. Return to use: bottles are filled and delivered.

That grouping gives you an overview. It also stops you from writing one sentence for every arrow.

Overview: Overall, the process has four broad phases, beginning with the collection of used bottles and culminating in the delivery of newly formed, filled bottles to shops. The main transformation occurs at the plant, where glass is prepared, melted, and molded.

Notice what the overview does not add. It does not name a recycling benefit, claim that all glass is reused, or say why the bottles are filled with juice.

Weak chronology and precise rewrite

Here is the weak version again, expanded:

First, people responsibly donate bottles so that the factory can create better products. Consequently, the bottles are sorted. The subsequent washing causes the glass to be crushed. Heat gives rise to a perfect new product, and the entire operation culminates in successful sales.

Now compare a precise rewrite:

Used bottles are first placed in street bins and transported by truck to a processing plant. They are subsequently sorted by color, washed, and crushed. The pieces are then heated until they melt, after which the liquid glass is poured into molds and allowed to cool. This sequence brings about the formation of new bottles. Finally, the bottles are filled with juice and delivered to shops, the stage in which the process culminates.

The rewrite is better because each verb matches visible evidence. Subsequently marks time. Brings about reports the transformation supported by “heated until they melt” and the molding stages. Culminates marks the final stage. The passive voice is also justified: the diagram shows affected objects but does not identify the workers who sort, wash, crush, pour, fill, or deliver them.

Passive voice is not automatically safer. Write the bottles are washed because the actor is omitted and the bottles receive the action. Do not turn an active natural process into a passive merely to sound formal.

Common mistakes

Treating every arrow as a cause

The bottles are sorted, which gives rise to washing overclaims. The visual shows washing next. Write The bottles are then washed.

Reversing source and result

Heating stems from liquid glass reverses the relationship. If the visual supports it, write The liquid glass stems from heating the pieces or Heating gives rise to liquid glass.

Using phase out for simple removal

Labels are phased out in one stage is inconsistent if the diagram shows one immediate removal. Gradual withdrawal must be visible.

Making culminate in mean cause

The furnace culminates in liquid glass is awkward because the furnace is an object, not the developing process. Write The heating stage results in liquid glass or make the whole series the subject.

Inventing an actor or purpose

If no worker appears, do not write employees carefully inspect the bottles. If no aim is stated, do not add in order to protect the environment.

Quick check

Choose the strongest answer based only on the stated evidence.

1. Stage B follows Stage A, but no causal link is shown. Should you use subsequent or consequent?
2. A fuel is reduced by one quarter each year until none is used. Is it removed or phased out?
3. X causes Y. Which keeps that direction: X gives rise to Y or X stems from Y?
4. Ten stages build toward final packaging. Can the process culminate in packaging?

Answers: subsequent; phased out is the more precise choice because the removal is gradual; X gives rise to Y; and yes, because packaging is the stated end point of a series.

Fresh practice prompt

An original diagram shows the production of paper notebooks. Waste paper is collected from offices, sorted, and mixed with water. The mixture is pressed into thin sheets and dried. The dry sheets are cut, stacked, and bound. Finally, covers are attached and the notebooks are packed in boxes.

Write an overview and one detail paragraph. Use one time marker and no more than two causal expressions. Before using stem from, give rise to, or bring about, point to the exact wording that supports cause. Use passive voice only for an affected object whose actor is omitted or backgrounded.

Sources

• https://ielts.org/take-a-test/test-types/ielts-academic-test/ielts-academic-format-writing
• https://ielts.org/take-a-test/preparation-resources/writing-test-resources

Related

• IELTS vocabulary for cause and effect
• IELTS vocabulary for change and trends
• Sunset vs. phase out
• Mitigate vs. eliminate, solve, or fix

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