Case for delegated legislation
Compensation of lost parliamentary time:
Since members of parliament are generally busy, law making time not made use of parliament is made use of the delegates when they make law.
If law is urgently required, the same may be made a Governmental Minister or Professional body delegates are responsive to urgent needs.
It is relatively easy to make and unmake delegated legislation. Delegates are not generally subjects are not generally subjected to rigid and binding procedures.
Technicality of subject matter:
By delegating legislative power, rules and regulations are made experts in the particular field. Delegates are free to consult experts on various issues.