Who, When, Why? Judging if a Source Can Be Trusted

Welcome, investigator. I am Atlas, and history is one giant mystery we solve using sources — letters, photos, speeches, maps, even an old shopping list. Here is the catch every historian learns fast: no source is a perfect window onto the past. Every one was made by a real person for a real reason, so every source carries a purpose and a point of view we call bias. Bias does not mean lying. It means the maker had a position, feelings, and only saw part of the story. So how do we judge whether a source is reliable — trustworthy enough to learn from? We ask four questions. WHO made it? Someone who witnessed an event directly has first-hand access, but even eyewitnesses can misremember or be influenced by fear, stress, or strong feelings. Their accounts still need to be read carefully. WHEN was it made? Something recorded close to the event often preserves fresh detail — but close-in accounts can also be incomplete or affected by shock. Distance in time can sometimes allow a writer to gather more information. Both timing and quality of information matter. WHY was it made? A private diary has a different purpose than a poster trying to persuade a crowd. FROM WHAT POINT OF VIEW? A king and a farmer describing the same harvest will notice very different things. Reliable sources are not the ones with zero bias — that source does not exist. They are the ones whose purpose and viewpoint we understand, so we can read them critically. Use the four questions as a checklist: start with WHO, move to WHEN, then WHY, then POINT OF VIEW. When you are unsure, run through each question in order — that checklist will always give you a place to start. When two very different sources agree on the same fact, your confidence grows.