Assessment of performance requires adequate qualitative and quantitative information. The country studies lacked some critical information. In most countries, information on regulatory outcomes is generally scarce. Data regarding the quality of drug products, drug information and distribution channels, especially in the illegal sector, are often unavailable or in short supply. Outcome data are difficult to obtain, and some process data are also unavailable. In most countries, data on violations and sanctions are either lacking or incomplete. This makes monitoring of the actual implementation of drug regulation difficult.