SECONDARY SCHOOL / EVIDENCE / DECISION
Showing something is not enough.
The skill is knowing what an image actually proves.
At secondary school, the decisions you make are about more than grades. You decide what to share, whom to listen to, what to believe and where to invest your time, money or reputation. Five scientific studies show that checking sources, working with evidence and asking precise questions are skills that can be developed.
Your attention is a working tool.
If you do not direct it, someone else will.ORIGINAL STUDIES / NOT MOTIVATIONAL SLOGANS
What the research actually found
In-text citations use the Harvard author–date system. Select the asterisk * next to a technical term to move to its explanation in the glossary. After reading it, select the asterisk next to the term in the glossary to return to the exact point where you left off. Each card separates the study’s findings from claims that would go beyond the evidence.
Can you find out who is behind the information?
Checking the author, the evidence and other sources
The digital literacy* lessons centred on three questions: Who is behind this information? What is the evidence? What do other sources say? Among 574 ninth-grade students, the mean score for evaluating authentic online content increased from 2.24 to 3.75 points out of nine (McGrew and Breakstone, 2023).
What the study supports: Targeted instruction can improve how students evaluate online information.
What it does not establish: Without a randomised control group, the study does not demonstrate a lasting effect in every situation.
Open the original studyCan you distinguish credible news from false news?
Training improved news discernment
Preregistered experiments in the United States and India tested a brief media-literacy intervention. On the study’s measure of discernment*, performance improved by 26.5% in relative terms in the US sample and by 17.5% in the more educated online sample in India (Guess et al., 2020).
What the study supports: A brief intervention can improve people’s ability to distinguish mainstream news from false news.
What it does not establish: It does not mean a 26.5% reduction in the lifetime risk of being deceived; the effect was neither identical nor equally durable across all groups.
Open the original studyCan you keep asking questions when someone sounds convincing?
An argument is not volume. It is a claim supported by evidence.
A multi-year programme of dialogic argumentation* taught young people to engage with opposing positions. The improvement transferred to independent essays on new topics, and students developed a stronger understanding of the relationship between evidence and argument (Kuhn and Crowell, 2011).
What the study supports: Guided argumentation can develop questioning, responses to counterarguments and the use of evidence.
What it does not establish: The research did not measure success in every personal conflict or a general “resistance to authority”.
Open the original studyCan you apply data skills beyond school?
Statistical reasoning in everyday problems
Four experiments showed that training in the law of large numbers increased the frequency and quality of statistical reasoning* in everyday problems. The researchers also observed transfer of learning* to domains that had not been directly practised (Fong, Krantz and Nisbett, 1986).
What the study supports: A method for working with data can transfer to a new decision-making context.
What it does not establish: The study does not demonstrate higher investment returns or more successful stock-market trading.
Open the original studyCan education influence real-world financial behaviour?
Evidence from 76 randomised experiments
A meta-analysis* of 76 randomised experiments* involving more than 160,000 participants found an average positive causal effect* of financial education on both financial knowledge and subsequent financial behaviour (Kaiser et al., 2022).
What the study supports: High-quality financial education can affect both knowledge and measured financial behaviour.
What it does not establish: The result is not a promise of profit, protection from every loss or a guide to trading.
Open the published study Open-access PDF versionFROM EVIDENCE TO ACTION
Five steps before you believe a claim
You can use the same process for a video, conversation, presentation, report, chart, contract or financial claim. It does not teach you to doubt everything automatically. It teaches you to know when to ask and what to verify.
Observe
Separate what you can actually see from what you immediately assume about it.
Ask
Ask a question that could either confirm or disprove your first explanation.
Verify
Identify the author, the origin of the data, the sample size and what independent sources say.
Argue
State the evidence behind your position. Respond to the counterargument, not the person.
Decide
Name the risk, the uncertainty and the reason your next step is proportionate.
An authority may have experience. A confident person may have influence. Neither is a substitute for evidence.
KEY TERMS
Glossary of key terms
Select the asterisk * next to a defined term to return to the exact point in the article where you left off and continue reading.
- Digital literacy *
- The ability not only to use digital tools, but also to assess the author, credibility, evidence, purpose and context of online information.Practical example: A video promises a guaranteed investment return. Before acting on it, you find out who funded the video, whether the creator earns money from the recommendation, where the figures came from and whether independent sources confirm them.
- Discernment *
- In this study, the difference in how participants rated the credibility of mainstream and false news. It is not a general-purpose “lie detector”.Practical example: A social-media post claims that your school has cancelled lessons. You compare the anonymous post with an official school announcement and reliable news coverage, paying attention to the quality of the supporting evidence.
- Dialogic argumentation *
- An exchange of claims, questions, counterarguments and evidence between people. The aim is not to shout the other person down, but to test the quality of the reasons.Practical example: A student disagrees with a teacher’s claim. Instead of saying “you are wrong”, the student explains which source or data supports a different conclusion, listens to the counterargument and proposes checking the evidence together.
- Statistical reasoning *
- Reasoning about data, samples, probability and variation so that one striking case is not automatically treated as a general rule.Practical example: A friend makes a profit on three trades and claims that the strategy always works. Three successes are a small sample; you need to examine a longer period, losses, fees and performance against the wider market.
- Transfer of learning *
- Applying a learned method to a new task or situation that is not identical to the original training.Practical example: You apply the source-checking process used for a school assignment when a company owner claims that a new working method is safe: you ask for the rules, measurements and independent evidence.
- Meta-analysis *
- A statistical synthesis of results from several comparable studies. It makes it possible to estimate an average effect across a larger body of evidence.Practical example: One school claims that a particular method greatly improved results. A meta-analysis of several comparable studies shows whether a similar effect appears repeatedly, rather than in a single striking case.
- Randomised experiment *
- A study in which participants are assigned at random to the groups being compared. Random assignment helps separate the effect of the intervention from other differences between people.Practical example: A head teacher wants to compare two tutoring programmes. Assigning students at random reduces the risk that one group contains only the more motivated or higher-performing students.
- Causal effect *
- A change that, given the study design, can be attributed to the intervention being examined rather than merely to two events occurring together. Causality means a cause-and-effect relationship.Practical example: The number of errors falls after a company introduces training. That alone is not enough to conclude that the training caused the improvement; the software, team or workload may have changed at the same time.
SOURCES
References
The references follow the Harvard author–date system and link directly to the original publications.
Fong, G. T., Krantz, D. H. and Nisbett, R. E. (1986) ‘The effects of statistical training on thinking about everyday problems’, Cognitive Psychology, 18(3), pp. 253–292. https://doi.org/10.1016/0010-0285(86)90001-0
Guess, A. M. et al. (2020) ‘A digital media literacy intervention increases discernment between mainstream and false news in the United States and India’, Proceedings of the National Academy of Sciences, 117(27), pp. 15536–15545. https://doi.org/10.1073/pnas.1920498117
Kaiser, T., Lusardi, A., Menkhoff, L. and Urban, C. J. (2022) ‘Financial education affects financial knowledge and downstream behaviors’, Journal of Financial Economics, 145(2), pp. 255–272. https://doi.org/10.1016/j.jfineco.2021.09.022
Kuhn, D. and Crowell, A. (2011) ‘Dialogic argumentation as a vehicle for developing young adolescents’ thinking’, Psychological Science, 22(4), pp. 545–552. https://doi.org/10.1177/0956797611402512
McGrew, S. and Breakstone, J. (2023) ‘Civic Online Reasoning Across the Curriculum: Developing and Testing the Efficacy of Digital Literacy Lessons’, AERA Open, 9. https://doi.org/10.1177/23328584231176451