The ActualActivity template describes how to represent a record of an activity that has at least started and may have finished - an actual activity.

It can be used to record any information about an actual activity, such as who has performed and/or reported the activity, what method (a specification of how to perform an activity) was followed, and when the activity was performed. It is mandatory to assign an identifier or name to the activity, and a start time, and to relate it to a method (activity method).

This template should not be used for recording activities that are performed by a product. e.g. a sortie flown by an aircraft, nor activities managed by a WorkOrder and DirectedActivity.

The ActualActivity 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 a activity is represented in the PLCS PSM.

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