Background information is essential for assessing whether the detailed harmonised indices provided by the Member States are sufficiently comparable.
Tá faisnéis chúlra riachtanach chun a mheasúnú an bhfuil na hinnéacsanna comhchuibhithe mionsonraithe arna soláthar ag na Ballstáit inchomparáide a ndóthain.