A general technique for increasing accessibilityunderstandability is to consider the typical level where the topic is studied (for example, [[secondary education|secondary]], [[undergraduate education|undergraduate]], or [[postgraduate education|postgraduate]]) and write the article for readers who are at the previous level. Thus articles on undergraduate topics can be aimed at a reader with a secondary school background, and articles on postgraduate topics can be aimed at readers with some undergraduate background. The lead section should be particularly understandable, but the advice to write one level down can be applied to the entire article, increasing the overall accessibility. Writing one level down also supports our goal to provide a tertiary source on the topic, which readers can use before they begin to read other sources about it.
