HCI Questions

HCI

Jan 09
Several types of Human Computer Interfaces (HCIs) are used with computer systems. Each type of HCI provides specific benefits to the user.

(a) Describe a sensible use and benefit of the following types of HCI.

You should describe a different use and benefit in parts (i) and (ii).

(i) A touch sensitive screeen. [2]


(ii) A biometric device. [2]


(b) Name an application which uses a voice interface and discuss any disadvantages associated with the use of voice interfaces. [3]

1 mark Description of use
In museums to allow children to gather information / in shops to enter info at POS
/ mobile phones to dial / display information

1 mark Benefit
Saves having to type, easier for disabled people to .., no need for mouse and keyboard,
quicker to enter information,

1 mark Description of use
e.g. retina scan / iris recognition to gain access to room, thumbprints to take out a library
book / registration systems / for security /instead of or as well as passports

1 mark Benefit
Individual / difficult to copy / better security(but cannot get in both parts)
Accuracy
Can lose smart cards

1 mark example and 2 marks for two problems
Or 2 marks for two examples and one mark for problem
Need to be clear that candidates are discussing input Speech recognition systems

e.g. Voice control in car navigation systems - not brand name
Security systems
Control systems
Telephone ordering system

Disadvantages
Have to train computer to recognise voice which takes a long time
Delays in getting commands recognised / rural accents / similar sounding words or commands /
background noise / security as people can hear password

Natural language interfaces
E.g. Giving instruction / asking question such as in expert systems.