Question

How does the OFF button act as an escape in Harel's state charts?

a.

It terminates the entire state chart diagram.

b.

It triggers the start of another subdialog.

c.

It puts the TV in standby mode regardless of its current state.

d.

It allows the user to select between alternative states.

Posted under Human Computer Interaction

Answer: (c).It puts the TV in standby mode regardless of its current state. Explanation:In Harel's state charts, the OFF button acts as an escape by putting the TV in standby mode regardless of its current state. This means that no matter where the TV is within the Sound and Channel subdialogs, pressing the OFF button will transition the TV to standby mode.

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Q. How does the OFF button act as an escape in Harel's state charts?

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