Cohesion and Cohesive Devices
A Complete Guide for Academic English Writing
1. Introduction: What is Cohesion?
In academic writing, an essay or paper must be more than just a collection of correct sentences. The ideas within it must connect logically and flow smoothly, allowing the reader to follow the argument from one point to the next without confusion. This quality of "flow" and connection is called cohesion.
Cohesion is the grammatical and lexical linking within a text that holds it together and gives it meaning. It is the "glue" that connects sentences, paragraphs, and ideas. A cohesive text is easier to read, understand, and be persuaded by.
Why is it important?
- Clarity: It makes your argument clear and easy to follow.
- Readability: It makes your writing smooth rather than abrupt and disjointed.
- Professionalism: It signals strong, sophisticated academic writing.
Cohesion is achieved through the use of cohesive devices, which are words or phrases that act as signposts, signaling the relationships between different parts of the text.
2. Types of Cohesive Devices
A. Lexical Cohesion (Linking through Vocabulary)
This involves using specific word choices to create connections.
1. Repetition of Key Words:
Environmental sustainability has become a primary concern for governments worldwide. Achieving environmental sustainability requires a multi-faceted approach.
2. Synonyms and Near-Synonyms:
The researchers conducted a detailed analysis of the data. Their investigation revealed several important trends.
3. Lexical Chains (or Sets):
The patient was admitted with a high fever and a persistent cough. Blood tests were conducted to check for pneumonia.
4. Superordinates and Hyponyms:
The experiment required a beaker, a pipette, and a Bunsen burner. All this equipment had to be sterilized.
B. Grammatical Cohesion (Linking through Grammar)
This involves using grammatical structures to create links.
1. Reference (Pronouns, Demonstratives):
Marie Curie is best known for her research on radioactivity. She was the first woman to win a Nobel Prize.
The data indicates a significant increase in global temperatures. This trend is a major cause for concern.
2. Substitution:
I need to purchase a new lab coat; the old one is stained.
3. Ellipsis:
The first trial was successful; the second [trial] was not.
C. Conjunctive Cohesion (Linking Words and Phrases)
These are also known as transitions or linkers. They act like traffic signs, indicating the relationship between one idea and the next.
| Function | Cohesive Device | Example Sentence |
|---|
3. Putting It All Together: An Annotated Paragraph
The theory of plate tectonics revolutionized geology in the mid-20th century. It provided a unifying framework for understanding earthquakes, volcanic eruptions, and the formation of mountain ranges. Before this conceptual shift, geologists struggled to explain these phenomena in a coherent way. For instance, the distribution of fossils across different continents was a major puzzle. However, once scientists understood that continents were not fixed but were moving plates, this previously baffling evidence became a cornerstone of the new theory. Consequently, the field of geology was able to advance at an unprecedented pace.
Click on the highlighted words above to see their function.
4. Common Mistakes to Avoid
Overuse of Transitions
Using a transition word in every sentence can make your writing sound robotic and clunky. Use them only when the relationship between ideas needs to be clarified.
Incorrect Choice of Device
Using "however" when you mean "therefore" can completely confuse your reader. Be sure you understand the precise meaning of the cohesive device you choose.
5. Practice Exercises
Exercise 1: Identifying Cohesive Devices
Read the following paragraph from an academic text on urban planning. Identify at least five cohesive devices and explain their function.
"Urban sprawl presents significant environmental challenges. For instance, it leads to increased greenhouse gas emissions due to longer commuting distances. Moreover, the conversion of natural landscapes into suburban developments results in habitat loss for many species. This loss can disrupt entire ecosystems. To mitigate these problems, urban planners advocate for smart growth principles. These principles encourage higher-density living and the development of public transportation networks."
- For instance: Exemplification (provides an example of an environmental challenge).
- Moreover: Addition (adds another related point about environmental challenges).
- This loss: Reference (refers back to "habitat loss").
- these problems: Reference (refers back to "increased emissions" and "habitat loss").
- These principles: Reference (refers back to "smart growth principles").
Exercise 2: Choosing the Correct Device
Choose the most appropriate cohesive device to complete each sentence.
1. The experiment yielded promising results; __________, the sample size was too small to draw definitive conclusions.
2. The financial crisis of 2008 had a global impact. __________, many countries experienced severe recessions.
3. The study aims to investigate the effects of sleep deprivation on cognitive performance. __________, it will measure reaction times and memory recall.
4. The rise of renewable energy sources is crucial for combating climate change. __________, solar and wind power are becoming increasingly cost-competitive.
Exercise 3: Improving a Paragraph
The following paragraph is disjointed. Rewrite it, adding appropriate cohesive devices to improve its flow and clarity.
"Artificial intelligence is rapidly advancing. It has the potential to solve complex global problems. There are significant ethical concerns. Job displacement is a major issue. Bias in AI algorithms can perpetuate social inequalities. We must develop regulations for AI."
Sample Answer:
"Artificial intelligence is rapidly advancing, and as a result, it has the potential to solve complex global problems. However, there are also significant ethical concerns that must be addressed. For instance, job displacement is a major issue. Furthermore, bias in AI algorithms can perpetuate social inequalities. Therefore, it is crucial that we develop regulations for AI to ensure its responsible development."