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; - assessment based on less than 3 cores; - use of microcores. NOTE In these cases provisions valid in place of use apply.