1. A process of updating a status of interference between three-dimensional (3D) objects in a system of computer-aided design (CAD), for subsequent analysis of status of interference, comprising: in a processor: (a) identifying: a set of data of a group of 3D objects in a CAD model, each 3D object of the group being a part and the CAD model being a product; a method of computation of interferences between objects in the CAD model, the computation being performed based on values; and an expected interference previously obtained as a result of executing the identified method using said set of data; (b) executing the identified method using the set of data to compute a current interference between the same 3D objects; (c) comparing the expected interference between the same 3D objects previously obtained with the current computed interference; (d) updating a status of the expected interference between the same 3D objects based on a result of the comparing step; (e) identifying a modified set of data, a computation method and/or an expected interference; (f) repeating the steps of executing, comparing and updating; and (g) using the updated status in rendering the CAD model on a display monitor.