We perform a series of experiments to determine the effect of acquisition function choice on unconstrained and constrained optimization analytic surfaces. The 2d continuous Dejong surface and the 2d categorical Michalewicz surface are used. The unconstrained and constrained versions of the surface are used, and the FWA and FCA-0.2 strategies are tested for the constrained tests. Results from these comparative experiments are shown in Fig. . In all tests, the UCB acquisition outperformed or had equivalent performance compared to the EI acquisition. Thus, we elected to use UCB in all experiments reported in this work. library, 3 and (iii) a constrained GA based on the DEAP library. Importantly, all strategies are compatible with optimization over parameter domains with a priori known constraints. This is essential for the FCA feasibilityaware acquisition strategy, where at each iteration α(x) must be optimized according to a learned constraint oracle P (feasible|x) > t, where t ∈ [0, 1).