外部风险——经济形势变得严峻是无法控制的，因此必须采取一切措施尽可能不受影响。虽然它们的损害程度可能无法确定，但如果预测到损害的类型，则可以使风险规避成为可能。假设，可能存在资金短缺，政府可以准备一个项目专用基金，帮助及时完成，甚至延迟，如果没有完全停止。这需要适当的远见，并对财务影响和项目可能受到影响的领域进行统计分析，使其处于休眠状态。Hoek & Palmeiri(1998)在处理岩土工程风险时，建议尽早、尽可能准确地定义所有岩土工程风险，将风险可能性降到最低。
Technical risk–To avoid overestimation and underestimation, the prime antidote is superior knowledge, gained by training, studying history, studying anticipated results, and coming to right judgement through right reasoning. The people involved must be well-prepared for analysing past projects of equal or higher magnitude and identify risks, pre-plan and eliminate its emergence (Kasser, 2002). There must be an agreed balance in assessing the budgets, risks, and benefits. Being either overly deficient or overly excessive does nothing but originate false numbers, affecting project costs that may grow exponentially. Thus, involving experts, conducting research, and assuming all eventualities can give a balanced view of the risk that can be avoided at minimal costs.
External risk – Economic conditions becoming grim is uncontrollable, hence all measures must be taken to stay as unaffected as possible. Though their extent of damage may be unascertainable, the type of damage if predicted can make risk avoidance possible. Suppose, there may be a financial shortage, the government can prepare a project dedicated fund which helps in timely completion, or even delayed, if not completely stalled. This requires proper foresight and undergoing statistical analysis of financial impacts and the areas of the project that can be hit rendering it dormant. Hoek & Palmeiri (1998), while addressing geotechnical risks, suggests that defining all geotechnical risks as early and as accurately as possible minimises risk likelihood.