The principle of the free movement of goods implies that products must be traded freely from one part of the Union to another. In a number of sectors this general principle is complemented by a harmonised regulatory framework, following the “old approach” (imposing precise product specifications) or the “new approach” (imposing general product requirements). The harmonised European product legislation, which needs to be transposed, represents the largest part of the acquis under this chapter. In addition, sufficient administrative capacity is essential to notify restrictions on trade and to apply horizontal and procedural measures in areas such as standardisation, conformity assessment, accreditation, metrology and market surveillance.