CUBES will consist of two main assemblies: the PRE-SLIT subsystem and the SPECTROGRAPH subsystem. The pre-slit unit consists of an image slicer, a slit viewer which is part of the A&G subsystem, a calibration unit, possibly a fiberlink connection to other Instrumentation (e.g. UVES and/or ESPRESSO, etc.) and an ADC. The spectrograph consist of three arms, divided by means of dichroics, each with their optimized dispersing element, camera and detector systems. Special attention will be given to the main structure and its flange interface to ensure repeatability in the rapid instrument re-installation.

The following figure shows the scheme of the elements composing the instrument and its functions.

Fig.1 Cubes elements and functions.