A method of manufacturing an article comprising: (a) performing an additive manufacturing process (110) to form an article (20) in an initial state, where the article (20) comprises assembly features (18) and the process Additive manufacturing comprises forming the article, including mounting features (18), additively from a material according to a computer model of the article (20), so that data on the position of a predetermined feature (6, 14 ) in article (20), in relation to the assembly characteristics (18), can be derived from the computer model； and (b) performing a second manufacturing process to transform the article (20) into a second state, where said second manufacturing process comprises: (i) assembling (130), through assembly features (18) formed during the additive manufacturing process, the article (20) in a clamping device (25) of a machine for operating on the article (20), and (ii) with the article (20) mounted and held by the clamping device ( 25) to define and maintain its location during the second manufacturing process, process (140) at least one feature (6, 14) in the article (20)； characterized in that the mounting features (18) are kinematic mounting features (18) that interact in the mounting step (i) with the corresponding kinematic mounting features (28) in the clamping device (25) of the machine, wherein in the processing step (ii) the position and orientation of the article (20) is known and defined in three linear degrees and three degrees of freedom of rotation within the operating volume of the machine (A) by placing the article (20) in the clamping device (25) for the mounting step (i) in a known general orientation and (B) by virtue of the interaction of the kinematic mounting characteristics (18) of the article (20) with those (28) of the clamping device (25) and wherein the location of the predetermined feature (6, 14) is determined in the processing step (ii) using data derived from the computer model including the position of
