投资项目评价多属于期前评价。在评价过程中常采用确定性分析方法,即假定项目评价所涉及有关参数的未来实际数与评价时预测结果相一致。这种假定条件下项目评价结果能反映项目总体经济性,但受外部环境和主观预测能力的限制,投资项目的实施结果,通常并不符合原来所作的某种确定性预 Most of the investment project evaluation is pre-period evaluation. In the evaluation process, a deterministic analysis method is often used, that is, it is assumed that the actual number of relevant parameters involved in the project evaluation is consistent with the prediction result during the evaluation. Under this assumption, the project evaluation results can reflect the overall economic performance of the project, but subject to the limitations of the external environment and subjective forecasting capabilities, the implementation results of investment projects do not always conform to certain certain predetermination.