Overview first

Claim: a document opens with what it is about and how it is organised (its parts, in a few lines or a simple map) before any detail.

What it asks

  • The first lines say what the text is for and who it is for.
  • Then the parts, three to five, in the order they come: a short list, an outline or a small map.
  • When only part of the text matters to a reader, say which part, and for what goal.

Why

A graphic organizer given with the text raised memory, g = 0.70, and comprehension, 0.53 (Ponce 2025). A topic given before a passage raises comprehension and recall; the same topic given after it does not (Bransford & Johnson 1972). Telling readers what is relevant raises learning of that part at no extra reading time (McCrudden 2007).

Limits

The classic advance organizer has a small effect: d = 0.21 on tests within a day, and 0.19 to 0.38 on later tests, rising with delay (Luiten 1980, 135 studies). The effect on tests a week or more later has a median of 0.48 across 112 effects (Stone 1983). Written organizers had a smaller effect than spoken ones, 0.17 against 0.37 (Luiten 1980), so a written overview is the weaker case. Whether it helps most on unfamiliar material is contested: Mayer's count of 44 studies said so, but Stone's effect sizes, from very few studies, did not confirm it (Stone 1983).

A network map did worse than a hierarchical one (Amadieu 2009), most for readers with little prior knowledge. A map should therefore follow the domain's own hierarchy. Stating what matters lowers learning of what was not named (Klauer 1984).

Overview first is not importance first: the evidence above is for organizers, which announce the parts. Putting the most important fact first, as news does, is a different order, and its two direct tests, both theses, disagree. In these tests, narrative order was better understood and recalled by Thai readers (Nildam 1998); importance order did marginally better on comprehension (p = .08, 58 readers), with no difference in memory (Sternadori 2008). So these tests are too few to decide; the plain-language standard advises it as a convention, the most important message "commonly at the beginning" (ISO 2023, convention).

In two experiments with Dutch readers (450 and 574), readers judged bad-news letters and e-mails that gave the explanation before the decision more persuasive in both, and more polite in the first. Perceived readability rose only in the first, and a comprehension test in the second found no difference (Jansen 2010, measured attitudes). Ratings of hypothetical messages in one culture: a limit to keep in mind, not a rule.