Teaching Critical Thinking
in Government and Aided Schools
India Institute, in collaboration with the Tamil Nadu School Education Department, designed a critical thinking curriculum for grades 8 and 9 students and evaluated it through a randomised controlled trial across 41 schools in one urban education block. The RCT is complete. The report is forthcoming.
India is among the countries most severely affected by organised disinformation. Fake news has contributed to communal violence, health crises, and financial fraud. State regulation and platform censorship have not resolved the problem.
A more durable response works on the demand side: equipping citizens to reason for themselves. Article 51A(h) of the Indian constitution mandates a scientific temper and spirit of enquiry and reform.
TNCT designed a standalone co-curricular subject for grades 8 and 9, structured around five transferable skill clusters:
- 01Reasoning through complexity
- 02Evaluating information systematically
- 03Drawing sound inferences
- 04Recognising and minimising bias
- 05Strengthening and weakening arguments
Sessions are oral-first, team-based, and built around stories and culturally grounded examples. All materials are available in Tamil and English.
The study was designed as a cluster randomised controlled trial (RCT), conducted across one urban education block in Tamil Nadu, to establish causal evidence of the curriculum\’s impact.
| Trial type | Cluster randomised controlled trial |
| Location | One urban education block, Tamil Nadu |
| Schools | 41 (19 treatment, 22 control) |
| Students | 6,711 (3,291 treatment, 3,420 control) |
| Grades | 8 and 9 |
| Baseline | October 2022: Tamil, English, Mathematics proficiency |
| Intervention | September 2023 to March 2024, one hour per week |
| Sessions | 30 planned; 5 to 19 delivered |
| End-line | April 2024: CT reasoning assessment and motivation survey |
| Hypothesis 1 | CT training improves reasoning ability |
| Hypothesis 2 | CT training improves motivation to learn (could not be tested; elections advanced year-end exams) |
The diagram below represents the expected causal chain from the CT intervention to measurable outcomes, adapted from the original study design.
- 5 skill clusters
- 30 sessions planned
- 1 hr per week
- Trained external tutors
- Tamil and English
- Systematic analysis
- Questioning assumptions
- Evaluating evidence
- Drawing inferences
- Active participation (self-reported)
- Less anxiety about complexity
- Interest in current affairs
- CT reasoning test scores
- Information evaluation scores
- Motivation survey administered
- H2 not formally tested; elections advanced year-end exams
No spillovers anticipated at school level. Household-level spillovers not measured. H2 (motivation to learn) not formally tested: elections advanced year-end exams.
TNCT aligns with four chapters of the SEP 2025 and is, to our knowledge, among the most concrete efforts to translate the SEP\’s critical thinking mandate from policy language into classroom practice. TNCT is also consistent with the National Education Policy 2020\’s emphasis on critical thinking and experiential learning.
The RCT is complete. Data collection is done and analysis has been carried out. The full report, covering results, methodology, effect sizes, and policy implications, is being finalised and will be published at tnct.indiai.org.
Should the Phase 1 findings confirm the model\’s effectiveness, the natural next step is an expanded pilot across multiple education blocks before a state-wide decision is made.