TNPC 5 is a dedicated software aimed to assist Calcified Structure interpretation, financed by the French institute IFREMER. Several years have been necessary to develop this software. The project begun in 1994 with Hervé Troadec's work, then other people contributed to it such as Ronan Fablet, Hélène de Pontual and André Ogor. TNPC provides several features that will be explained in details in this documentation : -Manage databases of images and associated data, -Batch processes on CS images, -Image acquisition with automatic stage, scanners, mosaics, -Save predefined data (radials, intensity curves) and user data (for example age interpretation). TNPC is based on the Visilog 6™ platform.