如果用近似模型来代替真实模型，那么近似模型精确度就变得非常重要。
If we substitute actual model for approximation model, the precision of approximation model is very important.
系统阐述了预测模型精确度比较、合理性检验、显著性检验等过程，指出了该领域的研究方向。
Then the accuracy comparison, rationality test and significance test of the forecasting models are systematically presented. Finally, the research directions of this area are briefly outlined.
增加模型精确度的一种已证实的方法是使用约束条件和对象约束语言(Object Constraint Language, OCL)。
A proven approach to add precision to a model is through the use of constraints and the Object constraint Language (OCL).
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