Frequently Asked Questions

The TNCT project is a curriculum design and evaluation initiative by India Institute, conducted in partnership with the Tamil Nadu School Education Department. It designed a critical thinking curriculum for grades 8 and 9 students in government and government-aided schools and tested it through a randomised controlled trial across 41 schools in an urban education block in Tamil Nadu. The RCT is complete. The full report is forthcoming.

India Institute is an independent national research and policy organisation. It conducts rigorous social science research in education, critical thinking, and social equity, and translates evidence into policy recommendations. More information is available at indiai.org.

The project was funded by an independent individual philanthropist. India Institute has no institutional affiliation with any political or corporate entity.

The ability to think clearly is fundamental to almost everything a person does: making decisions, forming views, evaluating options, understanding the world around them. It is not a specialist skill for the academically gifted. It is a practical capacity that benefits everyone, regardless of what they go on to do in life. A student who can reason carefully, weigh evidence, and spot a weak argument is better equipped for education, for work, and for civic participation.

The present moment adds a particular urgency to this general argument. Large-scale misinformation and disinformation affect millions of people who lack the tools to evaluate what they encounter online and in their communities. Fake news has contributed to health crises, financial fraud, and social unrest. A generation of students equipped to think critically would be significantly more resilient to these specific harms as well.

The Indian constitution, under Article 51A(h), calls on citizens to develop a scientific temper, humanism, and a spirit of enquiry and reform. Critical thinking education is the practical translation of that aspiration into classroom practice. See The Issue page for more.

Integrating critical thinking across every subject in every school would require overhauling teacher training, curriculum design, and assessment frameworks system-wide, a process that would take decades. Teaching it as a standalone co-curricular subject addresses the urgent need now, while the longer reform takes shape. It also allows the approach to be designed, tested, and evaluated rigorously without competing with subjects already in the timetable. See The Solution page for the full reasoning.

A randomised controlled trial is a study design in which participants are assigned to treatment or control groups by chance. This ensures that any difference in outcomes between the two groups can be attributed to the intervention rather than to pre-existing differences. It is the most rigorous method available for establishing that a programme caused an observed outcome, rather than simply being correlated with it. The Knowledge Base explains this in more detail.

Schools were drawn from the pool of eligible government and government-aided schools in one urban education block. Only willing schools participated. From this pool, 41 schools were selected and randomised: 19 were assigned to the treatment group and 22 to the control group. All 41 schools were in the same education block, reducing variation in administrative context and ensuring comparability.

Sessions were delivered by 12 trained external tutors recruited and trained by the project team. They were not regular school teachers. All were women between the ages of 20 and 45, each holding at minimum an undergraduate degree, with three holding a BEd. Tutors were assigned at the classroom level and moved between schools to teach their assigned classes according to the agreed timetable. Assignments were randomised where practical; where travel distance made this impractical, convenience-based assignment was used.

30 sessions of one hour each were planned across the intervention period. Disruption to the school calendar from unexpected developments during the intervention period reduced the number of sessions that could be conducted. Across treatment schools, sessions delivered ranged from 5 to a maximum of 19. This variance in dosage was accounted for in the analysis, with a per-session effect analysis conducted alongside the main impact estimation.

Hypothesis 1 (primary): teaching critical thinking skills will produce measurable improvements in students' ability to evaluate information, distinguish strong arguments from weak reasoning, and draw sound inferences. This was tested at end-line. Results are forthcoming.

Hypothesis 2 (secondary): CT training would also improve academic performance in regular subjects such as mathematics and language. Baseline proficiency data in Tamil, English, and Mathematics was collected for this purpose. However, the end-line assessment for regular subjects could not be administered. The announcement of general elections advanced the school year-end examinations, leaving no window for independent testing. Results for Hypothesis 2 will therefore not be reported.

The end-line assessment was administered by volunteers from the Tamil Nadu government's Illam Thedi Kalvi programme. To ensure independence, volunteers were not assigned to schools in which they already volunteered. Invigilator groups of two or three administered the test in each room. One invigilator read the questions aloud while each student also had a printed question booklet, keeping the assessment consistent with the oral-first approach of the curriculum. Answers were evaluated by trained CT teachers.

All ethical research practices were followed throughout the study. Government permission was obtained at each stage. Only schools willing to participate were included. All student data was de-identified before analysis, and findings are reported at the aggregate level only. Before the final report is published, a closed-door workshop will be held with Tamil Nadu School Education Department officials to review findings and implications.

The RCT is complete and analysis has been carried out. The full report is being finalised. When it is released, all findings, including results, methodology, effect sizes, and policy implications, will be published on this site in full.

TNCT aligns directly with four chapters of the SEP 2025: Chapter 4 (Enquiry-based Pedagogy), Chapter 5 (Critical Thinking and Problem-Solving Skills), Chapter 6 (Formative Assessment Approach), and Chapter 7 (Teacher Capacity Building in CT). The Policy Implications page covers this in detail.

The NEP 2020 also emphasises critical thinking, experiential learning, and higher-order reasoning skills as central goals of school education. TNCT is consistent with these objectives and contributes practical evidence toward how they can be pursued in government schools.

The model was designed with scalability in mind. The curriculum, tutor training approach, timetable integration process, and assessment design are all documented. Should the Phase 1 results confirm the model's effectiveness, the natural next step would be an expanded pilot across multiple education blocks in Tamil Nadu, with randomisation at multiple levels, before a state-wide decision is made. The Policy Implications page covers the case for scaling in detail.

The curriculum was developed for Tamil Nadu government schools and is currently in its pilot phase. The approach, built around stories, discussion, and culturally grounded examples, lends itself to adaptation for other linguistic and cultural contexts. Policymakers and education officials interested in learning more are welcome to write to us at policy@indiai.org.