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Decision Making and Problem Solving · 3 min read

What is the Law of Cause and Effect?

Learn the law of cause and effect and use three counter-case questions to test claims, avoid purpose myths and find the real set of causes behind any event.

Chris Farmer, Founder of Corporate Coach Group

“The law of cause and effect tells us that two events are truly linked only when they always show up together, stay away together, and rise or fall in step; by asking three counter-case questions we swap guesswork for proof, drop the purpose myth, and uncover the full set of causes behind any event.”

Chris Farmer — Founder, Corporate Coach Group

What is the Law of Cause and Effect?

What is the Law of Cause and Effect?

The law of cause and effect is: "Whenever two phenomena are present together, AND always absent together, AND vary proportionately together, then the two phenomena are almost certainly causally connected".

Let us discuss the law of cause and effect...

"Why things happen".

You have heard it said that "Everything happens for a reason". This statement is ambiguous, it has two possible meanings:

  1. Everything happens for a purpose (ie goals, aims) - this statement is false.
  2. Every event has causes (ie triggers, antecedents) - this statement is true.

1. NOT Everything happens for a purpose (ie goals, aims, objectives).

Most things that happen are NOT purposeful. If a volcano erupts, that has causes, but it has no purpose. If a child falls sick, that has causes, but it has no purpose.

Purpose is relevant in regard to action taken by living things. Living things act purposefully (ie intended to achieve a goal), inanimate matter does not.

2. Everything that happens has causes (ie triggers, antecedents, interrelated events).

On the other hand, everything is causal. Everything has a reason, in the sense of antecedent causes. A volcanic eruption has causes, a child's sickness has causes, an accident has causes; everything has causes.

How can we find the cause of any event?

It is not accurate to say, "every event has a (single) cause". Whenever we say, "a cause", we should say, "a set of causal conditions"; because every event has multiple causes.

For example, a fire has three causes; fuel, heat and oxygen. Whenever and wherever these three conditions exist at the same time, there is a fire. And if any one of these causes is removed, then the fire is extinguished.

In order to discover the cause (or set of causal conditions) of any event, remember this golden rule for causality:

The law of cause and effect states: "Whenever two phenomena are present together, AND absent together, AND proportionately vary together, then the two phenomena are causally connected".

For example:

  • If heat is applied to a metal, it expands.
  • If heat is removed from the metal, it contracts.
  • The degree of expansion of the metal is proportional to the heat applied.
  • Therefore, heat is the cause of the metal's expansion.

Whenever you are checking a claim about the apparent causes of some event, or thing, then ask the "counter case questions".

For example: Imagine you hear someone claim that "poverty causes crime".

  • Counter case for condition one: "Are there cases of people who are poor, ie they live in poverty and yet, are NOT criminals? Indeed, Yes.
  • Counter case for condition two: "Are there cases when people are rich, ie they don't live in poverty, and yet they still commit crimes? Indeed, Yes.
  • Is it true that the more a person falls into poverty the more criminal they become? and that the richer the person becomes, the less criminal they become? Definitely NO.
  • We can conclude then, that poverty does NOT cause crime - Keep looking!

Summary

The law of causality is: "Whenever two phenomena are present together, AND absent together, AND vary proportionately together, then the two phenomena are almost certainly causally connected".

When judging claims that "A" causes "B", ask the three "counter-case" questions:

  1. Are there ever instances of A, where no B occurs?
  2. Are there ever instances of B happening, in the absence of A?
  3. Does B vary with A in a proportionate way?

Law of Cause and Effect

When two happenings always show up side by side, always stay away at the same time, and rise or drop in matching amounts each time we test them, we can safely say one causes the other. If any one of these three checks fails, we must look for another cause.

CG4D Definition

Context: Decision making and problem solving
Genus: Principle

  • The two events are always present together
  • The two events are always absent together
  • Changes in one event match changes in the other
  • The pattern holds in repeat tests, proving causation

Article Summary

The law of cause and effect tells us that two events are truly linked only when they always show up together, stay away together, and rise or fall in step; by asking three counter-case questions we swap guesswork for proof, drop the purpose myth, and uncover the full set of causes behind any event.

Chris Farmer, Founder of Corporate Coach Group

Written by Chris Farmer

Founder & Lead Trainer, Corporate Coach Group

Chris Farmer is the founder of the Corporate Coach Group and has over 25 years experience designing and delivering leadership and management training across both the public and private sectors. His programmes are structured, practical and built around real-world performance. Read more about Chris and the story of how the Corporate Coach Group was founded.

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Key Statistics

The UK Health and Safety Executive reports that in 2023, 74% of workplace accident files contain a root-cause review, up from 55% in 2019.

A 2024 Gartner study finds that teams who map causes cut average fix time by 40% compared with teams who rely on ad-hoc judgement.

Frequently Asked Questions

Common questions about this topic

Two events link only when they always appear together, disappear together, and rise or fall in step.
A purpose is an aim chosen by living beings; a cause is any prior condition that makes an event occur.
Most events need several causal conditions. Remove any one and the event stops, so we must find the whole set.
Ask: Does A ever happen without B? Does B occur without A? Does B grow or shrink with A? These checks expose false links.
Heat a metal bar and it expands; cool it and it contracts. The size change matches the heat change, proving cause.
No. Two things may vary together by chance or share a hidden cause. All three law tests must pass to prove causation.
Fire needs fuel, heat and oxygen together. Take away any one and flames stop, proving many events need a full cause set.

Thought of something that has not been answered? Ask us today.

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