The archives of the ancient Near East do not correspond to a collection of cuneiform tablets preserved for their historical value, but more to a set of texts all kept in the same place, concerning the same individuals or dealing with the same topics. They were accumulated as long as they were considered to be useful. Besides uncovering official archives used by large organisations (palaces and temples), archaeologists have also excavated many private archives; these belonged to individuals and were found in their houses. Assyrian merchants' archives unearthed at Kültepe (the ancient town of Kaneš) in Central Anatolia represent the first important group of private cuneiform archives and they mainly date back to the nineteenth century BCE. These archives consist of letters, legal texts and memoranda. They were arranged on shelves or inside labelled containers using a classification system that gives us hints about the use merchants made of their archives. For more than three millennia, populations of the ancient Near East used cuneiform script to write down all types of texts, whatever the purpose, be it administrative, official, scholarly or private, for example. Cuneiform signs could be engraved on stone, metal or wax spread on wooden or (in exceptional cases) ivory tablets. However, the vast majority of texts in cuneiform script were impressed on fresh clay. Unbaked clay tablets were the standard vehicle of writing; clay was one of the most durable materials of antiquity. As a matter of fact, hundreds of thousands of clay tablets have been unearthed at sites all over the Near East, from central Anatolia to Iran, and to Egypt and Bahrain. Found in palaces, temples and private houses and arranged in specific rooms or areas of buildings, some groups of cuneiform tablets have been referred to as 'libraries', while the great majority of them are now known as 'archives'. The archives' content varies according to the type of building in which they were found. This paper focuses on private archives that once belonged to Assyrian merchants and were unearthed in their houses in the lower town of Kaneš (modern-day Kültepe in Central Anatolia). The content of these archives gives us information about their historical context and allows us to study their constitution. As an example, the analysis of the tablets excavated in 1993 has provided us with data about their owners, the filing systems employed for tablets and what such archives were used for.