The OE supports the Owner in reviewing the estimate build-up in the TOC. The effectiveness of this support will be related to how well the OE capability is matched to the Proponent's capability and the robustness of the estimating procedure to ensure a 'like-for- like' review of the TOC.
The selection of the OE should follow suitable criteria to address the skills mentioned in the Guide.
The Owner should ensure that the OE receives the benefit of gaining an understanding of the TOC components as they are developed during the TOC development process. Preferably, if an OCT is prepared, the Owner should be supported in this by the OE. Accordingly, the OE should be appointed early enough and resourced sufficiently to be able the OE to effectively assist in the preparation of the estimate and fulfil the OE role.