a) Provide three reasons why conventional approaches to task analysis may not be sufficient to analyse interaction with current generations of computer-based systems.

b) Briefly describe why `mood congruence' is a significant factor in the design of a successful computer game.

c)  Affective computing' is build on the idea that the users' emotions can influence their interaction with a computer system. Briefly explain why initial failure with a computer game might lead to the low expectations that increase the likelihood of future failures.

d) You have been asked to help a software house help in the design of a new version of a computer game. The clients are worried that a significant number of people purchased the earlier version of the game but then quickly abandoned it. Write a brief technique note that explains the difficulties of conducting lab-based tests to explain this apparent problem. Your note must also consider how best to assess the trade-off that exists between finding an optimal level of challenge and yet still provide the user with a sense of control.