SHMUC Use Case A3
A Long Nap: (Ver. 1.0)


SHMUC prototype  >  A_Duration_Use_Cases  >  A3_Over-Long_Nap


To recognise that a situation with an abnormal duration may be a problem

Actors Mary, the Smart Home, Debbie

Initial State

Mary was at home alone.


After lunch, Mary went into the living room to watch TV from 1300 to 1330. At 1330, she turned off the TV and then the system recognized that she was still on the sofa and so it assumed that she was taking a nap, as she often did. No activity was registered. At 1530 the system recognised that the nap was longer than usual. It reasoned that napping was not a dangerous activity and that Mary had had a disturbed night, and could therefore be tired. However, there was also the possibility that ill health was making her more tired than usual, or even that Mary was unconscious. The system therefore sent a message to Debbie informing her that her mother was assumed to still be asleep, but that it had
been more than two hours.

Norm The duration of Mary's afternoon nap is normally between 0 and 60 minutes


An alert message was sent to Debbie 

System Design Implications

Duration does not necessarily matter for some behaviours, unless there is some danger (e.g., of health problems) involved.

The description above assumes a high degree of world knowledge on the part of the Smart Home.  It is only justifiable to interpret the minimal information provided by simple Boolean sensor outputs in terms of such high-level concepts as "taking a nap" if those  outputs are augmented with an ontology of world knowledge. It would be preferable if the system could make its decisions without needing to know about concepts such as "taking a nap."