This is an official ODERSA website. Here’s how you know
The official domain

The address of this site ends in odersa.org. Every service the association runs sits on a subdomain of odersa.org and nowhere else. If the address in your browser’s address bar does not end in odersa.org, this site is not ours.

Free, and no account

Everything is open straight away. No sign-up, no account, no password, no subscription, no advertising. Nothing is held back for those who pay, because there is nothing to pay for.

No data collected

This site does not follow you: no tracker, no tracking cookie, no measurement tool built into these pages, and nothing measured on your device. Our host counts requests in aggregate, as any server that answers does: a total, never a profile. You do not have to take our word for it: open your browser’s developer tools, go to the Network tab, and reload the page. You will see the full list of what the site asks for. Everything comes from odersa.org, nothing goes anywhere else.

Free to reuse

The content is published under the CC BY 4.0 licence. You may copy it, translate it, print it and pass it on, for your classes as much as for the people around you, on one condition only: credit ODERSA.

FrançaisEnglishEspañolالعربيةहिन्दीবাংলা中文

The printable booklet


The 10 reflexes on paper: the version that gets pinned in the kitchen, handed out in workshops, and survives network outages.

A printer producing freshly printed pages of text.

Three moves

  1. Print this page: the button below, or Ctrl+P. The print layout takes care of itself, ideally double-sided.
  2. Fold or staple: the booklet fits on a few sheets, standard A4.
  3. Display it, hand it out, adapt it: the CC BY 4.0 licence is made for that.

Before You Believe It


The 10 reflexes for checking a piece of information before believing it, or sharing it

Display it, hand it out, adapt it: CC BY 4.0 licence.

01 Who is speaking?

Before weighing a claim, look at who is holding it.

  • Look for a name, a face, an organisation behind the message. Can't find one? That's already an answer.
  • Open the profile that published it: how old is it, what else does it post, what does the rest look like?
  • Separate the author from the messenger: the person forwarding you the info is almost never the one who wrote it.
  • Beware of “a doctor friend”, “someone who works there”: a source you cannot trace is not a source.

Keep in mind : No author, no trust.

02 What's the source?

Swim back up the stream to where the info was born.

  • Look for the link to the original document. There isn't one? Search for it yourself with a few precise keywords.
  • A screenshot is not a source: find the original post. It may be cropped, doctored, or invented.
  • “According to a study” with no study name = red flag. A real study has a title, a date, authors.
  • On an unfamiliar site, open the “about” page: who publishes it, from where, since when?

Keep in mind : Trace the source, not the megaphone.

03 What's the date?

A true story from five years ago can become today's fake news.

  • Look for a date: the publication date, and the date of the facts. They are often two different dates.
  • No visible date? Search the message's keywords: the first publication usually surfaces fast.
  • For a picture or a video, a reverse image search shows when it has circulated before.
  • Before sharing an alert or an instruction, ask: is it still current, here and now?

Keep in mind : Undated information can be made to say anything.

04 Does the image show what they claim?

A photo proves a scene existed, not that the caption is true.

  • Reverse image search: where and when has this image been published before, with what caption?
  • Interrogate the frame: what would you see just beside, just before, just after?
  • For a possibly generated image: hands, unreadable background text, inconsistent reflections. These are clues, never proof. The origin remains the real test.
  • Keep the two questions separate: is the image authentic? AND does the caption say what the image actually shows?

Keep in mind : An image proves the scene, never its caption.

05 Who else is saying it?

Important news never stays alone for long.

  • Take the claim's keywords and search them elsewhere: who else covers it, and what do they say?
  • Compare independent sources with each other, not ten copies of the same press release.
  • Nobody else mentions it? For a huge fact, that silence is a major clue.
  • Cross-check the source itself: what do others say about the site or account publishing this?

Keep in mind : News that stands alone isn't news yet.

06 Too good to be true?

The bigger the claim, the bigger the proof it owes you.

  • Measure the promise: “everything”, “never”, “100%”, “revolutionary”: the more absolute, the more suspicious.
  • Look at the offered proof: one tearful testimonial and three exclamation marks weigh nothing against a huge promise.
  • Ask who would gain if it were true… and why nobody else is talking about it.
  • Urgency (“last chance”, “before tonight”) exists to stop you from checking: that's precisely the moment to check.

Keep in mind : Huge promise, huge proof, or no deal.

07 What is it selling me?

Behind many “news items” there's an intention: sell, get clicks, scare, recruit.

  • Follow where the message leads: a shop, an affiliate link, a donation form, a subscription, a sign-up?
  • Spot the discreet mentions: “sponsored content”, “in partnership with”. They're often in tiny letters.
  • Does the content lean on a strong emotion (fear, anger, outrage) that pushes you to click and share? Emotion is a fuel that sells very well.
  • Ask yourself: if nobody clicked, would this message still exist?

Keep in mind : Find what it sells, and you'll know what it's worth.

08 Is the expert really an expert?

A grand title is not a competence, especially outside its own field.

  • Check the exact field: a doctorate, sure, but in what? And is today's topic inside that field?
  • Look for the institution: where does this person work, who can confirm it?
  • An “independent expert” is not more reliable by default: independence is not a competence.
  • Cross-check against the consensus: what do most specialists of that same field say? A lone opinion can be brilliant or wrong: it gets verified BEFORE it gets shared.

Keep in mind : Expertise has a home turf. Outside it, it's an opinion.

09 Does the number have context?

A number with nothing to compare it to says almost nothing.

  • Find the starting point: a percentage change without the initial value is a stage trick.
  • Bring it back to scale: “thousands” in a town or across a continent are two different stories.
  • Ask who measured: a poll has a sample size, a method, a sponsor.
  • On a chart, look at the axis: does it start at zero? Spectacular bars are often born from a cropped axis.

Keep in mind : A number without context is a costume.

10 What if I'm the one who's wrong?

The hardest reflex: fact-checking yourself.

  • Notice the pleasure: if a piece of news makes you really want to believe it (or triumphantly right), double your vigilance.
  • Deliberately search for what says the opposite, not to punish yourself, to test the strength.
  • You shared a mistake? Correct it, simply. Setting the record straight builds your credibility, never the reverse.
  • Accept “I don't know yet”: it's an honourable position, often the most honest of the three.

Keep in mind : Double-check whatever proves you right.

And to practise?

Hundreds of interactive training cases, free and without an account, are waiting online. The address is right below this paragraph.

https://avantdycroire.odersa.org

A project by ODERSA. Open content (CC BY 4.0).

Keyboard shortcuts

?Open this help
EscClose the panel or this help
1-3Pick an answer during the quiz
EnterNext case, once you've read the answer
TabMove from link to link: the whole site works by keyboard