The invention relates to a method for process monitoring during production of a finished part (112) in a primary shaping process. The method comprises the following steps: a) providing at least one mould (114) designed for the primary shaping process, wherein the mould (114) has at least one cavity (116) for receiving at least one starting material for the hot-crosslinking material, and wherein an apparatus for determining a mould internal pressure is also integrated into the mould (114); b) heating the mould (114); c) introducing the at least one starting material for the hot-crosslinking material into the cavity (116) under pressure such that the finished part (112) is produced; d) detecting a progression of the mould internal pressure occurring in step c); e) differentiating, at least once or at least twice, the progression of the mould internal pressure in order to determine at least one derivative selected from the group consisting of: the first-order derivative and the second-order derivative; and f) characterising a progression of a chemical crosslinking reaction by means of at least one derivative selected from the group consisting of: the first-order derivative and the second-order derivative.