Answer to Question #175567 in Web Development for Enam

Question

Question 3

a) The basic goal of HCI is to improve the interactions between users and computer systems by making computers more usable and receptive to the user’s needs apart from being able to function well. Applying all the usability heuristics by Jakob Nielson. Analyze how these heuristics were applied in the development of LEMASS.

b) The selection of input technology to be used in the interaction between humans and computers should be done carefully, as many input devices used may not always be suitable to the existing conditions. Explain to your brother in primary five with examples the differentiation between input technology and input devices.

c) Convincing him in your own words, describe four (4) factors that influence suitability of input devices.

Answer 1

a) The usability heuristics:

• Visibility of system status: the design should always keep users informed about what is going on, through appropriate feedback within a reasonable amount of time.
• Match between system and the real world: The design should speak the users' language. Use words, phrases, and concepts familiar to the user, rather than internal jargon. Follow real-world conventions, making information appear in a natural and logical order.
• User control and freedom: Users often perform actions by mistake. They need a clearly marked "emergency exit" to leave the unwanted action without having to go through an extended process.
• Consistency and standards: Users should not have to wonder whether different words, situations, or actions mean the same thing. Follow platform and industry conventions.

b) Input technology: method which uses different objects and ways to input information into computer. For example, image - for scanner, text - for keybord.

Input device - devices which use some input technology (mouse, keyboard, etc.).

c) Factors that influence suitability of input devices:

• Speed - the speed should not be low s compared to others.
• Cost - the cost should be reasonable.
• Capacity - it should be efficient.
• Reliability - it should be trust worthy.