This CEN Technical Report has been developed by CEN TC 125 and is aimed at providing guidance regarding factory production control (FPC) for designed masonry mortars (conformity system 2+). For prescribed masonry mortar, plaster and rendering mortar (conformity system 4) there is no requirement for involvement by Notified Bodies (NBs). Manufacturers of prescribed masonry mortars can use the guidance given in this document as a basis for establishing suitable factory production control procedures to enable demonstration of conformity with the standard and the declared values. The aim of this Guidance is to assist manufacturers in their work leading to CE marking of designed mortars. The guidance consists of - A general elaboration of Clause 8.3, factory production control, which is common to all the FPC references for the work of Notified Bodies and manufacturers to be found in Annex ZA, and - An inspection scheme containing specific checklists for designed masonry mortar, which is to be considered informative. NOTE This guidance document can be used for the evaluation of factory production control of other types of mortar that are produced in the same factory.