Sub-objectives define the conditions to fulfil the intents as spelt out in the root objectives.
Under the performance-based regulatory system, there can be 3 approaches to the design of fire safety works :
(i) Performance-based approach
(ii) Prescriptive (Deemed-to-satisfy) approach *
(iii) Hybrid of performance-based and prescriptive approach
* Prescriptive requirements of the Fire Code are known as 'deemed-to-satisfy' requirements in the performance-based regulatory system.