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Sensitivity analysis consist an integral validatory check of an all-inclusive validation of any multi-level code computer simulation model before the latter is used in performing any kind of analysis of operation, particularly so if a model is going to be used on an operational basis. A software platform/tool called GEM SA developed for performing a global sensitivity analysis (GSA) adopting the Bayesian theory is tested herein in the 1d SVAT model SimSphere with the aim to identify the most responsive model inputs, detect their interactions and derive absolute sensitivity measures concerning the model structure. The present study represents the first implementation of a global sensitivity analysis (GSA) method in SimSphere whereas the method presented here can be potentially adopted and applied to other simulation models including SVAT models. This study is very timely in terms of the overall validation of the model …