This study investigates how decisions are made in Tunisian public higher education establishments. Some factors are identified as having a potentially significant impact on the odds that the decision-making process follows the characteristics of one of the most well known decision-making models: collegial, political, bureaucratic or anarchical model. For this, this investigation was based on some statistical methods related to qualitative variables and allowing to measure whether the hypotheses, identified through an inductive analysis, are expressible in the same terms and with the same acuteness in all Tunisian public higher education establishments. In particular, the results showed that how decisions are made is related to the nature of the decision itself: collegiality for pedagogic and scientific decisions, bureaucratic for decisions related to institutional management and politic for academic personnel decisions. This finding can help the university leadership to evaluate and improve the governance in the higher education establishment.