The gas burner in Fig.
1 represents a typical conceptual model users have when
they interact with a gas stovetop. Associations with LTM are strong.
The control dial on the lower right turns on the gas. There is a
direct mapping of the user's goal to turn on the gas burner using this
control dial. After viewing this gas burner once, user's should be
able to easily
sketch a mental model of this burner design and predict its
functions. The button on the lower left, however, might be
confusing, as it is not part of the typical user's conceptual model.
This button provides a spark for gas ignition. This design could be
improved by getting rid of the ignition button and including it in the
control dial as many upper end models do.
The electric burner in Fig.
2 is even more consistent with a user's conceptual model
and should present no conceptual difficulties to typical users.
Fig. 1. Conceptual Model of a Gas Burner
Fig. 2. Conceptual Model of an Electric Burner