This project aims to elaborate a methodology to establish spatial dimension chains, with a vectorial and statistic approach. This methodology will be set in an algorithm in order to issue a software product. A calculation method for dimensional chains treated statistically as vectors, along with a software structure for calculation, will be developed, and the program will be experimented on well-known modules in mechanical engineering-technical drawing and assembly parts - as well as on other technologies-tolerances and machine manufacturing. Regarding the application of the method in technology, the starting point is the well known fact that the processing oil specific machine translates in the change of the reference system of the semi-fabricate from the functional-constructive reference system to the reference system of the processing automated tool.