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Requirements 
In the Workforce Deployment Server (WFD Server), a requirement represents work that has to be performed. A requirement contains the following attributes:
· Duration of the work to be performed
· Period in which the work is to be performed
· Required qualifications
· Location of the work to be performed
To be able to plan assignments, the planning service needs a requirement. When the requirement is covered by a resource, the result is an assignment.
The WFD Server searches for a suitable resource for each requirement, according to the resource's availability (time information that is mapped as a time allocation) and the qualification requirements.
Requirements can be refined, that is, they can form a hierarchical structure. Example: The XY enterprise requires a resource for 100 days, of which 50 days in the first quarter and 50 in the second quarter.
Requirements are entered using the application Service Resource Planning, for example, using the resource search. When the resource manager triggers the search, the requirements are transferred to the WFD Server. The WFD Server finds suitable and available resources for the requirements and transfers the resources back to the application.