The WorkRequest template describes how to represent a request for some work to be undertaken.

The WorkRequest is one of a set of templates used to represent work and activities. These are summarized in Figure 1 which shows that the model contains templates for:

• representing request and authority for work,
• managed planned authorized activities and a corresponding record of the work done,
• unmanaged planned activities and a corresponding record of the activity done,
• record of activities performed by a product.

The actual templates are:

• Managed work
  • The WorkRequest template represents a request for work to be undertaken;
  • The WorkOrder template represents the authorization of work to be undertaken, often in response to a WorkRequest;
  • The DirectedActivity template represents an activity that is planned to be undertaken under the authority of a given WorkOrder.
  • The WorkDone template represents a record of the work done in response to an authorized DirectedActivity.
• UnManaged activities
  • The PlannedActivity template represents an activity that is planned to be undertaken that is neither governed by a WorkOrder nor an activity to be performed by a product.
  • The ActualActivity template represents a record of an activity that is performed in response to a PlannedActivity.
• Product activities
  • The ActualProductUsage template represents a record of an activity that has been performed by a product, the usage of a product.

The SysML Block Definition diagram in Figure 2 shows how Work order is represented in the PLCS PSM.

The following SysML Part, Reference, and Value properties are defined for this template: