JNTU MCA 2019 HUMAN COMPUTER INTERACTION Previous Question Paper (April/May - 2019 - R13)

Good design enhances user productivity by reducing cognitive load and errors. It increases user satisfaction and trust, leading to higher adoption rates. Furthermore, it reduces training and support costs by making the system intuitive and easy to learn, and it ensures accessibility for a broader range of users.

Physical characteristics such as vision, hearing, touch, and motor control directly impact how users interact with hardware. For example, visual acuity determines the required size and contrast of text, while motor control (dexterity) influences the design of input devices like mice or touchscreens. Anthropometric data, such as hand size and reach, informs the ergonomic layout of physical interfaces to prevent fatigue and repetitive strain injuries.