The English expressions “to control” and “controlling” refer to the mastery, steering, and guidance of a process. Of course, this has a major impact on the process and the course it takes. It is thus essential that the objectives be exactly defined. Doing so greatly benefits operative planning and the resultant tactical planning. By collecting and analyzing data, one obtains the basis for making decisions and taking corrective measures to control such plan deviations. Post-ordering calculation is a central instrument of controlling for sub-contractors and contracting authorities and thus much more than just a simple comparison of columns of figures. Post-ordering calculation exactly compares the figures from pre-ordering calculation with actual costs. The costs are posted in the modules in which the individual costs are entailed and this data made available for post-ordering calculation according to the corresponding project / construction site. The comparisons of planned and actual values can take place on the basis of allocations on the project level, its documents, their titles, or the individual order lines. The clear arrangement of data and graphical displays make post-ordering calculation an important and logic-based tool for your project, too.