fire engineering design brief; design guidance; characterisation of building, contents, people and environment; fire initiation and development (sub-system 1/SS1); smoke development and management (sub-system 2/SS2); fire spread and management (sub-system 3/SS3); fire detection and suppression (sub-system 4/SS4); occupant avoidance (sub-system 5/SS5); fire brigade communication and response (sub-system 6/SS6)