SHMUC Use Case  E1

New Blender Installed: (Ver. 1.0)


SHMUC prototype > E_Environment_Change_Use_Cases  >  E1_New_Blender_Installed



To minimise the extra learning required when a new device is installed. 

Actors Mary, the Smart Home, Debbie

Initial State

There is a blender in Mary’s house.


Mary sometimes forgets to turn off electronic devices after using them, which can lead to some dangerous situations. For example, when she uses the blender, she forgets about it. The smart home can monitor the use of this device and issue an alert to Mary.

One day, Debbie discovered a blender that turns itself off every 90 seconds, so that it cannot be accidentally left on. She purchased this device for her mother, and replaced the old one. Any behaviours that involved the blender will change, but they can still be based on the experience that was acquired from the old blender until additional evidence is seen.

Norm Some devices, such as Mary's first blender, are normally turned off after use, and some, such as her new one, are not.


The behaviours that involved the blender were progressively updated as evidence was accumulated.

System Design Implications

Appliances can be categorised into those, such as blenders, hair-dryers, and stoves, that require turning off after use, and those that do not require turning off, either because they turn themselves off (Mary's new blender, modern kettles, toasters) or because they are left turned on all the time (refrigerators). In the database of world knowledge used by the smart home, this would be a Boolean property of each appliance.

This further suggests that there are two categories of world knowledge;