Answer:
Preliminary design stage
Step-by-step explanation:
During preliminary design stage, the engineers and other stakeholders involved in a project are tasked to carry out a detailed design and also give proposed methodology that would be used to achieve the desired results. Thereafter, when the design is approved, the design review follows as it is being implemented. The importance of having design review is that some site conditions may change and such aspects may not have been considered during preliminary design stage.