640bc943_IT_Service_Management_strategy__What_it_means
[Service catalog] Optional Service Features [Who provides it] ITSP -- This is derived from the outcome statements and service design package and further improvement activities. Clarifies and segregates costs for additional options, and is useful as a planning tool for what is necessary and for whom. [What it means] 
Describes features and functions of the service available on special request and often with additional cost. This can also be optional features for specific business units.
ITIL chief architect: How to build an IT Service Management strategy
What it means