Contextual Challenge (the problem that needs solving)

 

Bored of knocking on a door? Try the new door-o-matic 2000! Push the button to alert the occupant of a visitor. Perhaps your hands are full and it is easier to press the button than knock? Sore throat and cannot make much noise? We've got you covered! 

 

The below table helps us to prioritise the requirements for our door buzzer, this table is known as a SPECIFICATION.

Specification (the list of criteria that needs completing to solve the problem)

Must	Should	Could
lightweight to hang on a door	LED so you know you have pushed the button	be personalised with your name or a design on the front
method of attaching to the door handle	easy to change the batteries
loud enough to hear	the middle section is well folded
easy to use	the LED and switch should fit neatly into the case
Be safe to handle - no sharp edges	exciting colours