This paper aims at showing the utilization of the concept of Sensitivity Numbers in order to optimize field tests so that the reliability of the results obtained is maximized. This will be done with the help of the Entropy of Information concept, as developed by [1], thoroughly reviewed and applied by de Mello Franco, [2] to a Continuous Homogeneous Isotropic and Linearly Elastic medium. In de Mello Franco, [2] the concept of Sensitivity Numbers is adapted to overcoring problems and linked to the previous Entropy of Information concept. This paper presents this development in which these concepts are utilized for optimization of the distribution of rosettes, with a previously chosen layout, performed the overcoring tests in continuous rock mass. A synthetic case is modeled, Sensitivity Numbers are calculated, their Entropy Number is valuated and the best positions for the rosettes are consequently determined.