Estimation and prediction of software projects becomes guesswork, where only conservative assessment and previous experience can reduce the variables in play.
评估和预测对于软件项目来说变成了猜想，只有保守的估价和先前的经验能够在实践中减少变数。
Even so, the report says the prediction of substantial damage by 2030 is conservative.
即便如此，报告说到2030年发生大规模破坏的预测是保守的。
Therefore, the grey theory prediction is conservative and more secure.
另外，也讨论了各种预测方法的适用性与应用条件。
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