Making changes to a project is much cheaper in the design documentation stage, rather than during onsite construction. Accurate Construction documents (CD) during SD (Schematic designs) phase and DD (design development) phase in the Architectural design process is crucial. An accurate set of documents ensures that design intent is communicated to all stakeholders and collaboration between teams’ results in accurate and detailed design deliverables. 3D BIM models give project owners a quick snapshot on how the project will unfold in the Architectural Design Process and further on as well. https://www.hitechbimservices.com/blog/what-is-sd-dd-cd-mean-in-construction-world.php