This study, that investigates two specific types of quantitative restrictions, namely import prohibitions and quotas, is part of a broad reflection aimed at learning more about the nature and scope of non-tariff measures. The analysis reviews information on these measures contained in the WTO Trade Policy Reviews, WTO notifications and in various other trade reports. The objective of the report is to contribute to discussions, particularly on market access for non-agricultural goods, at the WTO, or elsewhere. The research revealed that the use of quotas and prohibitions for economic reasons has declined, but most countries use prohibitions as part of their regulatory frameworks for protecting human safety and health or the environment, and this tendency appears to be increasing. Traders would benefit from greater transparency of these measures. Also, there are import bans hampering the international trade in used goods, whose circumstances and appropriateness in terms of regulatory efficiency merit scrutiny.