How to use the data about costs and efficiency in program evaluation?

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With the cost and benefit figures in hand, it's time to perform the analysis. Depending on the timeframe of the project, this may be as simple as subtracting one from another; if the benefits are higher than the cost, the project has a net benefit. However, in practice, people express preferences for a much wider set of public goals, which makes the measurement of benefits and cost much more complicated than monetary amount. Consideration should be given to the prevailing understanding of the public good and how this is best served. Information on costs, benefits and risks is rarely known with certainty, especially when one looks to the future. This makes it essential that sensitivity analysis should be carried out, testing the robustness of the results.