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Notes on Strong and Weak Arguments

Logical Reasoning for Law Entrances

Distinguishing between strong and weak arguments is a fundamental skill that enhances one’s ability to assess the validity of statements, make informed decisions and construct persuasive discourse. This distinction forms the cornerstone of logical thinking and rational analysis. 

Let’s delve into the concepts of strong and weak arguments, their definitions, characteristics and how to differentiate between them.

Strong Arguments


A strong argument is one in which the conclusion is strongly supported by the given premise or evidence. It demonstrates a high degree of relevance, coherence and logical connection between the premise and the conclusion.


  • Presents compelling and convincing evidence.
  • Exhibits a direct and logical connection between the premise and the conclusion.
  • Withstands scrutiny and counterarguments.
  • Resists alternative interpretations.
  • Often based on well-established facts or widely accepted principles.


Premise: The crime rate in the city has significantly decreased over the past year.

Conclusion: The implementation of community policing has contributed to the reduction in crime.

In this example, the premise provides a clear and relevant reason for the conclusion, making it a strong argument.

Weak Arguments


A weak argument lacks sufficient evidence or logical coherence to support its conclusion effectively. The connection between the premise and the conclusion may be tenuous, vague or inconclusive.


  • Contains insufficient or irrelevant evidence.
  • Displays a weak logical link between the premise and the conclusion.
  • May be easily refuted or undermined by counterarguments.
  • Relies on assumptions that are not adequately supported.


Premise: The weather forecast predicts rain for tomorrow.

Conclusion: Therefore, the upcoming cricket match will be cancelled.

Here, the premise (rain forecast) does not necessarily lead to the conclusion (cancelled cricket match), making it a weak argument.

Differentiating Strong and Weak Arguments

  • Relevance: A strong argument maintains high relevance between the premise and the conclusion, while a weak argument may lack this strong connection.
  • Evidence Quality: Strong arguments rely on solid evidence, data or facts to support the conclusion, while weak arguments often lack substantial and credible evidence.
  • Logical Coherence: Strong arguments exhibit a clear and logical flow from the premise to the conclusion, whereas weak arguments may have gaps or inconsistencies in their logical structure.
  • Counterargument Resistance: Strong arguments can withstand scrutiny and counterarguments, while weak arguments are more vulnerable to challenges.
  • Assumption Dependence: Weak arguments may heavily rely on unstated assumptions or speculative claims, while strong arguments are more self-contained.
  • Alternative Explanations: Consider whether there could be alternative explanations or interpretations that weaken the connection between the premise and the conclusion.
  • Strength of Persuasion: Strong arguments are more likely to persuade an audience due to their compelling nature, while weak arguments may leave the audience unconvinced.


The ability to differentiate between strong and weak arguments is an essential skill in critical thinking and logical analysis. Mastering this skill empowers individuals to assess statements, evaluate evidence and engage in well-reasoned discourse. 

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