Perhaps the single most important lesson learned from the Knowledge Warehouse project is not a revelation but more of a reminder and it could be summarised by the five Ps – Proper Preparation Prevents Poor Performance. The S1000D specification may be daunting but the authors have tried to help implementers with the notion of the Business Rule Decision Points. Reviewing these rules and making appropriate decisions in preparation for an implementation will go a long way to making the project run more smoothly. Enforcing these decision using BREX will ensure that this discipline is maintained, even after the implementation is complete.