This document discusses structural building codes and their goals of establishing minimum safety standards, consistency, and reducing uncertainty. It notes that codes aim to strike a balance between explicit requirements, which increase consistency but complexity, and implicit requirements, which allow flexibility but also variability. The document examines different code formats and highlights trends toward more explicit standards in areas like load definitions, resistance calculations, and detailing over time. It concludes that codes need to balance explicit and implicit rules to optimize safety and cost.