The user would like to monitor how long a MachineryItem is powered on and doing an activity and wants to monitor the expected remaining lifetime of a MachineryItem or other aspects of a machine (like the remaining time a software licence is valid).

That leads to the requirements:

• The total time a MachineryItem is turned on and the total time an activity is done can be accessed (see section 14).
• The remaining estimated lifetime of a MachineryItem or other aspects of a machine can be accessed (see section 15).