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In this study we investigate the abilities to determine the credibility of digital news among 483 teenagers. Using an online survey with a performance test we assess to what extent teenagers are able to determine the credibility of different sources, evaluate credible and biased uses of evidence, and corroborate information. Many respondents fail to identify the credibility of false, biased and vetted news. Respondents who value the importance of credible news seem to hold a mindset helping them to determine credibility better than other respondents. In contrast, respondents self-reporting to be good at searching information online and who find information online trustworthy are not very good at civic online reasoning. Our findings, which may be linked to theories of disciplinary literacy, science curiosity and overconfidence, provide a basis for further research of how to better understand and support civic online reasoning in classrooms and society.

Critical thinking is brought to the fore as a central competence in today's society and in school curricula, but what may be emphasised as a general skill may also differ across school subjects. Using a mixed methods approach we identify general formulations regarding critical thinking in the Swedish curriculum of school year nine and seven more subject-specific categories of critical thinking in the syllabi and national tests in history, physics, mathematics and Swedish. By analysing 76 individual students' critical thinking as expressed in national tests we find that a student that thinks critically in one subjects does not necessarily do so in other subjects. We find that students' grades in different subjects are closely linked to their abilities to answer questions designed to test critical thinking in the subjects. We also find that the same formulations of critical thinking in two subjects may mean very different things when translated into assessments. Our findings suggest that critical thinking among students comprise different, subject-specific skills. The complexity of our findings highlights a need for future research to help clarify to students and researchers what it means to think critically in school.

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With the rise of misinformation, there is a great need for scalable educational interventions supporting students’ abilities to determine the trustworthiness of digital news. We address this challenge in our study by developing an online intervention tool based on tutorials in civic online reasoning that aims to teach adolescents how to critically assess online information comprising text, videos and images. Our findings from an online intervention with 209 upper secondary students highlight how observational learning and feedback support their ability to read laterally and improve their performance in determining the credibility of digital news and social media posts.