Written records aren't the only way, or even always the earliest way, that human societies have preserved their own history. Long before writing existed at all, and in many societies for a long time even after writing existed elsewhere in the world, oral tradition served as the primary means of preserving genealogies, laws, historical events and cultural knowledge across generations — and it did so not through simple, casual memory, but through genuinely structured techniques specifically designed to preserve information reliably and resist the kind of gradual, unintentional distortion casual retelling would otherwise introduce.
Structure and repetition, not raw memory alone, preserve accuracy
Societies relying on oral tradition to preserve important historical or genealogical information typically developed specific formal techniques to help protect that information's accuracy over repeated retellings across generations, including fixed formulaic phrasing, structured verse or rhythmic patterns, and mnemonic devices specifically designed to make an error or omission more immediately noticeable to both the reciter and a knowledgeable audience. A tightly structured, rhythmically fixed piece of oral history resists small errors slipping in unnoticed far better than loosely remembered free prose does, because a break in the expected fixed rhythm or pattern is much more immediately noticeable, both to the person reciting it and to a knowledgeable audience following along, than an equivalent small error would be in unstructured, ordinary retelling.
Trained specialists, and social accountability, added a further layer of protection
Many societies with strong oral traditions further protected the accuracy of important historical or genealogical information by entrusting its preservation and formal recitation specifically to trained specialists — figures whose formal social role centred specifically on learning, preserving and accurately reciting a community's history, genealogy or law, sometimes trained from a young age through many years of guided practice under an established, existing specialist. Because these specialists' recitations were often performed publicly, in front of an audience that itself included others with real, independent knowledge of the same history, a recitation containing significant errors could be recognised and corrected by that audience relatively quickly, adding a real, working social accountability mechanism to the preservation process that went well beyond any single individual reciter's own memory alone.
What we're still unsure about
The general existence of these structured techniques, and their real role in helping preserve oral tradition's accuracy across many documented societies, are well established in anthropological and historical research on oral tradition. What remains genuinely harder to assess with real precision is exactly how accurately a specific oral tradition preserved a specific historical event or genealogy over a genuinely long span of time, particularly once that tradition's own earliest stages predate any independent written or archaeological record that could directly verify it — researchers studying oral tradition's historical reliability generally have to rely on internal consistency, comparison across independent versions, and whatever corroborating archaeological or later written evidence happens to be available, rather than being able to check a given oral tradition's earliest, otherwise unrecorded claims against fully independent verification.
This sits inside Oral Traditions & Historical Memory, one of seven topics in Cultural History, one of seven domains in History, one of seventeen subjects the app can quiz you on.