Ex ante efficiency analysis evaluates an action's or decision's potential efficiency in advance, enabling proactive modifications. Making well-informed decisions is where it excels. But because it depends on projections, uncertainties can affect it. On the other hand, ex post efficiency analysis provides real results by assessing efficiency after an event. While this provides specific insights, it might not be as timely as ex ante research. Furthermore, hindsight bias could skew judgements made in the past