This International Standard gives some alternative measuring methods for the determination of shape, dimensions and dimensional deviations of buildings and building products which are relevant to fit. The methods tan also be applied when accuracy data are being collected in factories or on building sites. Information is given about deviations of Parts of buildings or of building products which tan be determined with the equipment described. The measuring methods concern primarily those objects the faces of which are rectilinear in shape and whicn have a modulus of elasticity larger than 35 kPa, for example concrete, wood, steel, hard plastic. Building products consisting of glass wool and similar soft materials are not the subject of this International Standard. Rules for quality control in all stages of measurement such as frequency Checks, place, time, etc., are not covered by this International Standard. Part two of this International Standard gives the Position of measuring Points to be used in the measurement described in this part. To facilitate Cross-referencing, the same numbering is used in the two Parts of this International Standard.