This International Standard defines terms to facilitate understanding of the terminology relating to test sieves and test sieving . La presente Norme internationale definit une Serie de termes en vue de faciliter Ia comprehension de Ia terminologie relative aux tamis et au tamisage de controle. lt applies to test sieves in accordance with ISO 565, ISO 3310-1, ISO 3310-2 and ISO 3310-3, and to test sieving processes in accordante with ISO 2591-1.