IELTS Reading Preparation: How to Master Diagram/Flowchart Completion

IELTS Reading has several question types, and among them the ones candidates tend to struggle with most are **Diagram Completion** and **Flowchart Completion**. These questions require not only reading and understanding the passage, but also organizing complex information and putting it into the form of a diagram or a sequence of steps.

For example, the steps of a scientific experiment, the flow of historical events, or the structure and workings of a building are shown in a diagram, and you fill in the blanks using appropriate words from the passage. Because you need to find information while linking both the text and the diagram, it can be called a question type that tests your overall ability in **"reading comprehension + analysis + summarizing"** within Reading.

In addition, questions carry a word limit such as "No More Than Two Words", and you are required to pick the correct words from the passage and answer accurately within the limit. If you do not understand the order of information and the cause-and-effect relationships, there are many cases where you cannot choose the right answer even after finding the relevant part of the passage.

This article thoroughly explains Diagram/Flowchart Completion questions, from the basic way of thinking to practical answering steps, points to watch and effective study methods. Please master the strategies introduced here so that you can stay calm on test day.

Diagram Completion and Flowchart Completion are formats in IELTS Reading in which **you fill in blanks in a diagram or a sequence of steps using words from the passage**. Each has its own characteristics.

1. Diagram Completion

• There are blanks in a figure, illustration, map or structural diagram, and you read the passage to fill in suitable words.
• Examples include the structure of an organism's body, how a factory or machine works, and the floor plan of a building.
• You need the ability to find the matching explanation in the passage based on a visual image.

2. Flowchart Completion

• A flowchart showing steps or a process has blanks, and you fill them in with information from the passage.
• Common subjects are "the flow of an experiment", "a manufacturing process" and "the order of historical events".
• The ability to understand the order of events and cause-and-effect relationships is important.

Common points

• Answers are taken directly from the passage (no paraphrasing or inventing your own).
• In most cases there is a word limit such as "No More Than ... Words".
• Your answer must fit the grammar before and after the blank.

The feature of this format is that it tests the ability to match the passage with the diagram while understanding the overall flow, not just simple word searching.

When tackling Diagram/Flowchart Completion questions, the key is not to start reading the passage right away, but to grasp the flow from the diagram and the questions first. Solving them in the following steps is efficient.

1. Check the diagram or flowchart first

• Check the positions of the blanks and the flow, and grasp the outline of the topic.
• Look at the order of arrows and numbers to understand "how the information progresses".

2. Check the word limit

• Always check instructions such as “No More Than Two Words”.
• Exceeding the limit makes the answer wrong immediately, so it is important to get used to how words are counted.

3. Look for keywords

• Pay attention to the **keywords** written in the diagram or flowchart (proper nouns, technical terms, etc.).
• Be aware of linking them to paraphrased expressions in the passage.

4. Scan the passage and check

• The order of the questions and the order of the passage are often **the same**.
• Be aware of the information before and after each blank, and narrow down the candidates.

5. Choose the right answer

• Check that the meaning fits and that it is grammatically correct.
• Watch out for singular/plural and verb forms.

6. Review at the end

• Have you kept to the word limit?
• Are there any spelling mistakes?
• Does it match the diagram and the flow?

By getting used to this flow, you can answer accurately even within the limited test time.

In Diagram/Flowchart Completion questions, the wording of the passage does not always match the questions and the diagram exactly. In many cases, **paraphrasing** is used. Whether you can spot it greatly affects your accuracy.

Paraphrasing verbs

• cause → lead to / result in
• produce → generate / create
• use → employ / utilize
• begin → start / initiate

Paraphrasing nouns

• method → technique / approach
• problem → issue / challenge
• step → stage / phase
• result → outcome / consequence

Paraphrasing of adjectives and adverbs

• important → significant / crucial
• quickly → rapidly / promptly
• different → varied / diverse

Example

• Question: The process begins with the use of a special material…
• Passage: The procedure is initiated by employing a unique substance… Here, use → employ and begins with → initiated by have been substituted.

Getting used to such paraphrases makes the "bridge" between the question and the passage smoother.

In Diagram/Flowchart Completion questions, it is easy to think that you only need to pick answers from the passage, but if you do not watch for the detailed rules and traps, you will lose marks.

1. Spelling mistakes

• A single wrong letter makes the answer **immediately wrong**.
• Be especially careful with technical terms and proper nouns.

2. Singular and plural mistakes

• If the passage says plants and you write plant, it is wrong.
• Always check whether a noun needs a final -s.

3. Overlooking the word limit

• There are many cases where candidates write three words even though the instruction says “No More Than Two Words”.
• Do not forget that articles (a, an, the) also count as one word.

4. Answers that do not fit the grammar

• If you put in a word while ignoring what comes before and after the blank, the whole sentence becomes unnatural.
• Example: verb forms (gerund vs base form) and the choice between adjective and noun.

5. Filling in by guessing

• Inventing words that are not in the passage is not allowed.
• The rule is to always find the answer in the passage.

By always keeping in mind that you "take the words directly from the passage" and watching the points above, you can reduce careless mistakes.

For Diagram/Flowchart Completion questions, it is important not to simply "do lots of questions" but to practice with awareness of the process of arriving at the correct answer. You can train effectively with the following methods.

1. Get used to the format with past papers

• Use past papers from the Cambridge IELTS series and focus on practicing only Diagram/Flowchart questions.
• After answering, always check "where in the passage the answer was written" and verify the evidence.

2. Make a keyword correspondence table

• Note down the words that appeared in the questions together with the **paraphrased expressions** used in the passage.
• By creating your own "paraphrase dictionary", you can use it on the next questions.

3. Practice drawing diagrams

• Read English articles on science and history and **summarize the information in the passage in your own flowchart or diagram**.
• You build the habit of understanding the passage by its "structure".

4. Solve with the time limit in mind

• The real Reading test is a race against time.
• Decide the time you can spend on each question and practice, aiming to balance speed and accuracy.

5. Analyze your weaknesses

• Classify the causes of your mistakes into categories such as "spelling mistakes", "plural forms" and "overlooked paraphrases".
• By repeatedly eliminating your weaknesses, you can avoid making the same mistakes.

In this way, rather than ending with "solve and check the answers", analyzing the evidence and process behind your answers leads to a higher score.

Diagram/Flowchart Completion is a difficult format in IELTS Reading that tests **information organization, summarizing ability and understanding of paraphrase all together**. It requires not only finding the right words in the passage but also reading the flow of the diagram or flowchart and matching the information accurately.

The key points for success are as follows:

• First look at the diagram or flowchart to grasp the overall picture
• Always check the word limit and take care not to exceed it
• Get used to paraphrases between the passage and the questions
• Do not fill in by guessing; find the evidence in the passage
• Thoroughly prevent mistakes in spelling, singular/plural and grammar

Effective study methods include focused practice with past papers, creating a paraphrase notebook, and practicing summarizing the passage in a diagram.

To score reliably on test day, accuracy + speed + familiarity are essential. If you adopt the strategies introduced here and practice repeatedly, you can greatly improve your scoring ability on Diagram/Flowchart Completion questions.