208 Software Requirements Specification for a Smart Home
4.1 Use of SH Features
4.1.1 SH System shall be usable by those with slight eye loss.
4.1.1.1 System shall not have any buttons smaller than one (1) inch
square.
4.1.1.2 System shall have all consoles and controlling devices
between four (4) and five (5) feet from ground level.
4.1.1.3 System shall have backlighting on all buttons for nighttime
ease of use.
4.1.1.4 System shall have options to increase and decrease font sizes
on Web interfaces and all console and controlling devices.
4.1.1.5 System shall have liquid layouts for all graphical interfaces
for display on many different types of display devices.
4.1.2 System shall be easy to use.