This European Standard:- gives methods and procedures for the assessment of the in-situ compressive strength of concrete in structures and precast concrete components;- provides principles and guidance for establishing the relationships between test results from indirect test methods and the in-situ core strength; - provides guidance for the assessment of the in-situ concrete compressive strength in structures or precast concrete components by indirect or combined methods.This European Standard does not include the following cases:- where indirect methods are used without correlation to core strength;- assessment based on cores less than 50 mm in diameter;-