The Basic Design phase develops the approved conceptual design into coordinated and detailed technical documentation that defines system capacities, layout decisions, and design criteria. This phase includes the preparation of technical specifications, utility sizing, User Requirement Specifications (URS) for process and major utility equipment, Piping and Instrumentation Diagrams (P&IDs), and airflow or pressurization diagrams. The work is carried out through close multidisciplinary coordination to ensure compliance with GMP requirements, operational safety, reliability, and cost efficiency, while providing a more accurate project cost estimate compared to the conceptual stage.