The consultation of papers on any kind of intervention is a lengthy, difficult and often non-exhaustive operation. A valid alternative to this is the memorisation of information (tables, texts, drawings, pictures, videos and sounds) on CD-ROM or other computer systems where all information is connected in a logical way, in a sequence or divided into different "branches". This allows an easy consultation, circulation and research of information, moreover it does not take a lot of room and protects paper documents from deterioration due to repeated consultation.

Computer systems for classification and recording are being used increasingly. They can be customised in order to satisfy any special requirement : from the configuration of complex connected systems to user-interfaces for data input. Data-display systems may be set up both for internal use and for communicating data (even on the Internet).

There is also a special function for the management of numerical data coming from surveys on built-up areas, which is used for metrical surveys (with error averaging), statistics, geometrical surveys (research of modularity, generatrix and construction lines), and structural-historical surveys.