Used and loved by millions
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
was a key factor
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "was a key factor" is correct and usable in written English.
It can be used to indicate that something played an important role in a particular outcome or situation. Example: "The team's collaboration was a key factor in the project's success."
✓ Grammatically correct
News & Media
Science
Academia
Alternative expressions(20)
played a crucial role
was instrumental
contributed significantly
was a major influence
was central to
was essential for
play a significant role
played a large role
played a vital role
had a considerable impact
played an important role
played a major role
occupying an important role
fulfil an important role
play a major role
played a significant role
had an impact on
plays a major role
has played a key role
played a big role
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
57 human-written examples
Bucks Coach George Karl said Collins was a key factor in the Nets' victory.
News & Media
It is certain that Arkhipov's reputation was a key factor in the control room debate.
News & Media
Grizzle, a senior, was a key factor in Florida's victory last year.
News & Media
The insecurity was a key factor in the exodus, according to residents.
News & Media
When Bach was elected, it was widely speculated that Putin's support was a key factor.
News & Media
"It was a key factor in the Industrial Revolution," Mr. Schaeffer said.
News & Media
For Sara Baume, the recession was a key factor in finding her voice.
News & Media
But it is fair to say that the Latino vote was a key factor this year.
News & Media
"But he was negligent, and his negligence was a key factor in causing Barbara Stanley's death".
News & Media
Determining the age of the new fossils was a key factor in establishing their evolutionary significance.
While postseason experience is sometimes overrated, it was a key factor for the Spurs.
News & Media
Expert writing Tips
Best practice
When using "was a key factor", ensure you clearly specify what it influenced or contributed to. This provides context and strengthens your argument.
Common error
Avoid using "was a key factor" without providing specific details. For example, instead of saying "Experience was a key factor", specify what was achieved because of the experience: "Extensive experience was a key factor in securing the project funding."
Source & Trust
86%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "was a key factor" functions as a predicate nominative, identifying a subject complement that renames or describes the subject. This expression commonly attributes significant influence or importance to a particular element or aspect within a given context, as demonstrated by the numerous examples found by Ludwig.
Frequent in
News & Media
58%
Science
21%
Academia
7%
Less common in
Formal & Business
5%
Wiki
2%
Social Media
0%
Ludwig's WRAP-UP
In summary, "was a key factor" is a versatile phrase used to highlight the significant influence of something on a particular outcome. Ludwig AI identifies it as grammatically correct and very common, appearing frequently in news, science, and academic contexts. To ensure clarity, specify the influence and avoid vagueness. While alternatives like "played a crucial role" and "was instrumental" exist, "was a key factor" remains a straightforward and widely accepted choice.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
played a crucial role
This alternative emphasizes the importance of the role played.
was instrumental
This suggests something was essential in achieving a result.
was a significant element
This highlights the importance of the element.
contributed significantly
This emphasizes the contribution made to an outcome.
was a major influence
This highlights the impact something had on something else.
was central to
This indicates something was at the heart of the matter.
had a decisive impact
This emphasizes the conclusive effect something had.
was a critical component
This highlights the essential nature of the component.
was paramount
This suggests something was of the highest importance.
was a determining influence
This emphasizes the power something had to shape an outcome.
FAQs
How can I use "was a key factor" in a sentence?
Use "was a key factor" to emphasize that something played a significant role in a specific outcome. For instance, "Collaboration "was a key factor" in the project's success".
What are some alternatives to saying "was a key factor"?
You can use alternatives like "played a crucial role", "was instrumental", or "was a significant element" to convey a similar meaning.
Is it better to say "was a key factor" or "was the key factor"?
The choice depends on the context. "Was a key factor" suggests one of several important elements, while "was the key factor" implies it was the most important element.
What is the difference between "was a key factor" and "was a major factor"?
While both indicate importance, "was a key factor" is slightly more general, whereas "was a major factor" suggests a more substantial or significant influence.
Editing plus AI, all in one place.
Stop switching between tools. Your AI writing partner for everything—polishing proposals, crafting emails, finding the right tone.
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
86%
Authority and reliability
4.5/5
Expert rating
Real-world application tested