Cause and Effect Reasoning for CLAT: Root Cause Method

📑 On this page

⚡ The short answer

A cause-and-effect question asks for a root cause, a contributing factor, a consequence, or what would reverse a trend. Turn every "led to" in the passage into an arrow, then place each option on that chain. The root cause is the earliest link the passage supports. The top trap: a symptom (absences, delays, complaints) dressed up as the cause.

🎬 The 30-second story

The mock score mystery

“My mock score fell from 92 to 71 in one month.”

📉

Meher

Meher, three months from CLAT.

“Obviously the new mock series is harder. Switch series.”

📝

Aarav

Aarav blames the paper.

“Your batchmates took the same series and went up. What changed for you?”

📊

Zoya

Zoya checks the control group.

“…I started scrolling reels till 2 a.m. in March. Now I make silly errors early on.”

📱

Meher

The chain comes out.

Tara's verdict: The silly errors are a symptom. The chain: reels → lost sleep → poor focus → errors → lower score. The harder series is ruled out because others on it improved. The root cause is the earliest link the facts support, and it explains why she fell when others didn't.

How does CLAT ask cause-and-effect questions?

Stem you'll see	What it really asks	Where
"A potential root cause of the decline"	The earliest link the passage supports	2024 Q97
"What makes X a contributing factor?"	The feature linking X to the effect	2024 Q98
"How might X affect Y?" / "consequence"	The next link only	2024 Q100, Q102
"Which is NOT the effect of…?"	The one the passage never links	2022 Q133
"Which, if true, would reduce the decline?"	Reverse a cause the passage names	2023 Q107

→ scroll to see more

Older aptitude papers also give two bare statements and ask which caused which. CLAT now hides the same logic in a caselet: a consultant, a factory, a currency. The chain is the same; only the packaging changed.

What is the difference between a root cause and a symptom?

A symptom is what you can see going wrong. A root cause is the first link that, if removed, makes the later links fade. Ask "why?" until the passage stops answering. The last answer it supports is your root.

🕒 Timeline

Meher's chain, root to symptom

📱
Root

Reels till 2 a.m.

Starts in March. Nothing in the facts explains it further.
😴
Link 2

Five hours' sleep

Caused by the scrolling.
🌫️
Link 3

Poor focus in the first hour

Caused by the lost sleep.
❌
Symptom

Silly errors, score falls to 71

What everyone sees, and what wrong options name.

⚔️ Side by side

Root cause vs symptom

🌱Root cause

the earliest supported link

•Fix it and the later links fade
•Explains why this case differs

🤒Symptom

a later link you can see

•Fix it and the cause regrows it
•Often what the cause 'led to'

Test	Root cause	Symptom
Where it sits	Start of the chain	Middle or end
Typical wording	lack of, poor, low motivation	absenteeism, delays, complaints

📌 Supported, not imagined

The root cause is the deepest link the passage supports, not the deepest one you can invent. If the text never says why workers are demotivated, "bad management" is your guess, not the answer.

What is the method for root-cause questions?

1
Draw the chain
Every led to, because, resulted in becomes an arrow on the rough sheet.
2
Place each option
Before or after the thing asked about? Or off the chain?
3
Match the question
Root cause = earliest supported link. Consequence = the next link, not a far-off one.
4
Use the control group
If a rival has the same feature and is doing fine, that feature alone is not the root cause.

Which cause-and-effect traps does CLAT set?

The control group is the clue most students skip. CLAT drops in a competitor, a batchmate or a neighbouring city that shares one feature. Use it to cross that feature off.

🔗 Cause check

The fest queue: is the new app to blame?

Claimed cause

The fest's new ticketing app

⟶

caused?

Observed effect

Hour-long entry queues

Before you buy the link, rule these out

🔀 Another cause

The fest next door used the same app with no queues

same cause, no effect · weakens the claim

🔀 Another cause

Only 9 of 40 gate volunteers turned up

a cause the rival didn't have · weakens the claim

⚙️ The missing link

The app needs a trained volunteer at every gate

how the app contributes · strengthens the claim

The app contributes only through the people it needs. The root lies with the volunteers.

Classic pairs: which came first?

🧩 At a glance

The four relationships between two events

➡️I causes II

Fare hike announced, then a protest called.

⬅️II causes I

The later-printed event happened first. Check the tenses.

🕵️Common cause

Both flow from a third event, like a heatwave or a strike.

🎲Independent

No shared subject, no chain. Rarer than students think.

🔗 Cause check

Same month, same cause

Claimed cause

Kabir's iced-tea sales jumped in May

⟶

linked?

Observed effect

The hostel's electricity bill jumped in May

Before you buy the link, rule these out

🕵️ Third factor (causes both)

A May heatwave: more cold drinks, more coolers running

↙ ↘ drives both · weakens the claim

Neither causes the other. Both are effects of a common cause.

⚠️ The five-links-ahead consequence

Asked what absences might do, the right answer is the next link (delays), not "the company will shut down". A consequence that needs four unstated steps is a guess.

Worked examples: cause and effect, step by step

✍️ Worked example Warm-up ⏱ 20 sec

The bus-pass protest

I. The state raised students' bus-pass price by 40% from 1 July.
II. Student unions have called a protest march for 10 July.
(A) I causes II (B) II causes I (C) Common cause (D) Independent

1
Dates: the hike (1 July) precedes the march (10 July), so II can't cause I.
2
Chain: a price hike on students plausibly sparks a student protest.

Answer: (A) I is the cause, II the effect

⚡ The exam-hall shortcut

Dates first. They kill one option in most pairs.

✍️ Worked example CLAT level ⏱ 35 sec

Flights and schools

I. Dozens of flights out of Delhi were cancelled on Monday morning.
II. Many Delhi schools declared Monday a holiday.
Same options.

1
Same day: dates don't settle it.
2
A cancelled flight doesn't close schools; a holiday doesn't ground planes.
3
Dense smog or fog does both.

Answer: (C) Both are effects of a common cause

⚡ The exam-hall shortcut

Two different bodies reacting on the same day: hunt for the third event.

✍️ Worked example Tricky ⏱ 70 sec

Kabir's watery coffee

Kabir's weekend sales fell 30% between March and May. A cheaper rival opened next door in January, yet sales held steady through February. In March Kabir switched to a cheaper milk supplier. Since March, online reviews mention "watery coffee", and several regulars now go to the rival.

The most likely root cause?
(A) The rival café opening
(B) The switch to a cheaper milk supplier
(C) The negative online reviews
(D) Regulars moving to the rival

1
Chain: cheaper milk (March) → watery coffee → bad reviews, lost regulars → sales fall.
2
A: the rival was open in Jan–Feb with no drop, so it's ruled out.
3
C and D are later links. D is where customers went, not why.

Answer: (B) The cheaper milk supplier

⚡ The exam-hall shortcut

Match the start of the fall (March) to the change that began in March.

How has CLAT asked cause-and-effect questions?

📝 Asked in CLAT 2024 · Q97 Root cause vs symptom

Imagine you have just been appointed as a consultant for a manufacturing company that is experiencing a decline in its production efficiency… Your task is to identify the root causes of this decline and recommend solutions. As you begin your investigation, you gather information and observe the following: • The company recently introduced a new production system that is more automated but requires highly specialized operators. • The workforce has reported a lack of motivation and job satisfaction, which has led to increased absenteeism. • There have been several breakdowns in the new machinery, leading to production delays and quality issues. • The company's competitors have adopted similar automation technologies and are experiencing increased productivity. • Customer complaints about product quality have increased in recent months.

Based on the information provided, which of the following is a potential root cause of the decline in production efficiency?

AThe introduction of a new production system

BLack of motivation and job satisfaction among the workforce

CIncreased absenteeism

DBreakdowns in machinery

Reveal answer + reasoning

Answer: B

Draw the chain: low motivation → absenteeism; breakdowns → delays and quality issues → complaints. Now the control group: competitors have similar automation and are more productive, so the technology is not the root. Low motivation sits at the start of a chain and is something the rivals aren't shown to share. Answer B.

Why the others fail

A — Competitors adopted similar systems and gained. The system alone can't be the root.
C — The passage says low motivation led to absenteeism: a symptom, one link later.
D — A nearer cause of delays, mid-chain. Nothing marks it as the starting point.

📝 Asked in CLAT 2024 · Q98 Contributing factor

Same caselet: the new production system "is more automated but requires highly specialized operators"; competitors with similar automation are experiencing increased productivity.

What makes the introduction of the new production system a potential contributing factor to the decline in efficiency?

AThe system is highly automated

BIt requires specialized operators

CThe machinery is prone to breakdowns

DCompetitors have adopted similar technologies

Reveal answer + reasoning

Answer: B

Competitors share the automation and thrive, so automation isn't the weak point. What can go wrong is the skill the system demands, and the passage flags it with "but". Answer B.

Why the others fail

A — Rivals are automated too, and gaining.
C — A separate observation, not a feature of the system.
D — Shows the technology can work: the opposite of a problem.

📝 Asked in CLAT 2024 · Q99 The control group

Same caselet: the company and its competitors adopted similar automation; the company reports demotivated workers, machine breakdowns and rising complaints, while competitors report increased productivity.

What is a critical difference between the company's situation and that of its competitors?

ABoth the company and its competitors have introduced new production systems.

BThe competitors have experienced increased customer complaints.

CThe company's workforce lacks motivation and job satisfaction.

DThe company's machinery is prone to breakdowns.

Reveal answer + reasoning

Answer: C

Rivals use similar technology, so machine-side differences are weak candidates; the human side is the company's own. C is the difference that explains why the same tech gives opposite results. Answer C.

🔬 Option autopsy

Autopsy: 2024 Q99

The critical difference from competitors?

A Both have introduced new production systems Tag it

🔄 Opposite direction

A similarity, when the question asks for a difference.

B Competitors have more customer complaints Tag it

❓ Not supported by the text

The passage says the company's complaints rose, not the rivals'.

C The company's workforce lacks motivation Tag it

✅ Correct

The one feature that is the company's own and explains the gap.

D The company's machinery is prone to breakdowns Tag it

🌗 Half right

Breakdowns happened, but 'prone' blames machines that rivals share in similar form.

🔄 Opposite direction❓ Not supported by the text✅ Correct🌗 Half right

Guess the trap behind each option, then tap to check. Wrong options fail in a handful of predictable ways.

📝 Asked in CLAT 2023 · Q107 Reverse the causes

…The Russia-Ukraine war has disrupted supply chains causing commodity prices to rise, leading to a worldwide hardening of inflationary trends. This, in turn, has caused major central banks to raise interest rates, forcing investors back to the safe haven of the US dollar… Higher interest rates in developed country markets have caused a significant outflow of portfolio investments from India… One way the Reserve Bank of India could stem the tide would be to sell off dollars in the market…

Based on the author's arguments, which of the following, if true, would reduce the decline in value of the rupee?

AAppointing a new Governor for the RBI who has a better sense of how to control inflationary trends.

BA steep increase in commodity prices and the continued disruption of supply chains.

CA reduction in worldwide inflationary trends and the reduction of interest rates in developed country markets.

DThe RBI buying as many dollars as possible from the market.

Reveal answer + reasoning

Answer: C

Chain: war → commodity prices → global inflation → higher rates abroad → money flows to the dollar → rupee falls. Reverse the named links and the fall slows. C reverses two of them. Answer C.

🔬 Option autopsy

Autopsy: 2023 Q107

What would reduce the rupee's decline?

A A new RBI Governor better at controlling inflation Tag it

🛸 Out of scope

The author blames global forces, never the Governor's skill.

B A steep rise in commodity prices, continued disruption Tag it

🔄 Opposite direction

Strengthens the causes, so the rupee falls faster.

C Lower worldwide inflation and lower rates abroad Tag it

✅ Correct

Reverses two named links in the chain.

D The RBI buying as many dollars as possible Tag it

🔄 Opposite direction

The author says selling dollars helps. Buying adds dollar demand.

🛸 Out of scope🔄 Opposite direction✅ Correct

Guess the trap behind each option, then tap to check. Wrong options fail in a handful of predictable ways.

Also asked: the same caselet's Q100 (absenteeism → "delays in production") and Q102 (complaints → "loss of customers") reward the next link. 2022 Q133's odd one out, "relations with the Middle East", is an effect the passage never names.

Which cause-and-effect myths should you drop?

💥 Myth vs fact

Traps students fall for

🙅 Myth

The most visible problem is the root cause.

Tap to bust it →

✅ Fact

Absences, delays and complaints are usually effects. Look one link earlier.

🙅 Myth

Whatever happened just before is the cause.

Tap to bust it →

✅ Fact

Timing narrows it; you still need a chain the passage supports.

🙅 Myth

A rival with the same feature is irrelevant.

Tap to bust it →

✅ Fact

It's your control group. It rules that feature out.

🙅 Myth

Two events in the same week must be linked.

Tap to bust it →

✅ Fact

Check for a common cause first.

Can you find the root cause? Quick quiz

🎯 Quick quiz

Five chains to untangle

0 / 5

I. Delhi–Srinagar air fares tripled this week. II. Landslides have shut the Jammu–Srinagar highway since last Monday.

Q1. Which is right?

I. Most shops in the old city stayed shut on Friday. II. Buses did not run in the old city on Friday.

Q2. Which is right?

A coaching centre's results fell sharply this year. In April it doubled batches from 40 to 80 without hiring. Teachers say they can't check answer sheets any more; students say doubts go unanswered. The faculty is unchanged. A rival facing the same CLAT pattern, with batches of 40, improved.

Q3. The most likely root cause?

Last week the city raised parking fees in its busiest market from ₹20 to ₹80 an hour, to cut congestion. Residential lanes 500 metres away have free parking, and the metro is a 15-minute walk.

Q4. The most likely immediate effect?

Kabir's café has long queues at 9 a.m. because one barista both takes payments and makes every coffee.

Q5. Which change most directly cuts the queue?

🎯 Cause and effect in a nutshell

Draw the chain: every led to is an arrow.
Root cause = the earliest link the passage supports.
Consequence = the next link, not a far-off one.
A rival sharing a feature rules that feature out.
Classic pairs: dates first, then chain, then common cause.

📎 Cheat sheet

"Root cause" → draw the chain, take the earliest supported link.
"Contributing factor" → the feature linking X to the effect.
"How might X affect" / "consequence" → the very next link.
"Difference from competitors" → control group → what only this case has.
"Would reduce the decline" → undo a named cause.
"Best solution" → course of action → fix the root.

Train your chain-drawing

Timed caselets with root-cause and consequence questions, every option explained.

Practise cause-and-effect drills

Frequently asked questions

What is a root cause in CLAT logical reasoning?

It is the earliest link in the chain of causes that the passage supports, the one that, if removed, makes the later problems fade. Visible problems such as absences, delays or complaints are usually symptoms. Ask why repeatedly until the passage stops answering; the last supported answer is the root.

How do I tell a cause from an effect in two statements?

Fix the time order first from tenses and dates: a later event cannot cause an earlier one. Then ask whether the earlier event plausibly produces the later one. If neither produces the other but both could flow from a third event, choose common cause.

Why do competitors appear in CLAT cause caselets?

They are a control group. If a rival shares a feature, such as the same technology, and is doing well, that feature alone cannot be the root cause. The right answer is usually what the company has and the rival does not.

How far ahead should a consequence go?

One link. CLAT rewards the direct, next effect the passage supports, such as absenteeism causing delays. Options predicting dramatic outcomes several steps away, like a shutdown, need assumptions the passage never gives.