This exercise is aimed at building a complete observing program for the VLTI. It consists in defining the scientific rationale and immediate objectives, ensure that the target are observable, define the VLTI configuration, model the astrophyiscal source and estimate the expected signal-to-noise ratio. At the end one should be able to define the total time requested and the final configuration. This exercise is a simulation of the work required to eventually request time on the VLTI.