a) Please provide BRIEF answers to the following questions:

1. What does the acronym HTML stand for?
2. Describe two problems with 'think aloud' evaluations.
3. Describe two situations in which keyboard input might be preferred over speech for data entry.
4. What is a user interface widget?
5. What is the significance of 7 (+ or - 2) for human-computer interaction?

[2 marks per answer, 10 marks in total]

b) Why do Internet retrieval delays continue to be a problem even for those users who have high- performance computers and good network connections?

[3 marks]

c) Explain why relatively short but unpredictable delays create greater usability problems than longer delays that users can anticipate.

[5 marks]

d) You have been asked been asked to design the user interface to an e-commerce web site. The site will sell expensive, luxury cars to members of the public. Write a brief technical report describing how you would test the site to determine whether retrieval delays will create significant usability problems for the users of this site.

[7 marks]