# They should make a user friendly interface also they

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want information to be all over the screen. They should make a user-friendly interface. Also they could create friendly keyboards for older people that might get confused with these. They can create an audio record keyboard so you can speak instead of type.

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Part 2: System Reliability 4. (a) R= r 1 x r 2 x r 3 = (0.200)(0.500)(0.700) = 0.070 (b) The total reliability of the system will decrease. The reliability of a serial system decreases if we add components because there is a greater chance the system fails since if one fails all system fails. Note: assuming the reliability of the new component is less than 1. If the reliability of new component is 1 it will remain the same. (c) The overall reliability of the system will increase. The reliability of a parallel system increase as we increase the components in the system. A failure of one component does not necessarily cause a failure on the entire system. 5. (a) R= 1- [(1-r 1 ) (1-r 2 ) (1-r 3 )]= 1-[(1-.80)(1-.25)(1-.50)]= 0.925 (b) The overall reliability will decrease, the reliability of a serial system decreases if we add components to the system. Note: assuming that the reliability of the new component is less than 1. If the reliability of the new component is equal to 1, the overall reliability wont be affected, it will remain the same. (c)
The overall reliability will increase. The reliability of a parallel system increases if we add components to the system. A failure of one component does not necessarily cause a failure in the entire system, because its information can be processed by an alternative component.

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• Fall '19
• Usability, 0%, Human reliability, Human Reliability Analysis

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