The following are four key critical design review for a SharePoint project.
Cost Estimate - Production cost model is known and kept updated, needed aspects are allocated and tracked against targets.
Technical Baseline Documentation + Digital Artifacts - Detailed design is modeled which includes an interface description and mockup if desired.
Risk Assessment - All risk assessments and risk mitigation plans are documented, formally addressed and implemented.
Technical Plans - The preliminary design review (PDR) is successfully completed. This includes all needed documentation, set-up and hand-off as needed.