By by Pontus Johansson.

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2 Interaction Modalities and Context-of-Use Spoken input is acceptable—and even preferred in the relaxed home contextof-use—by the subjects. However, multimodal input where direct manipulation and speech input could be used unaccompanied as well as combined is a desirable interaction feature. g. a remote control or similar device. Three situations where users would like to use the remote control are: 1. When they are not allowed to make noise, such as when speaking would disturb the rest of the household.

This raises the question of how to “fill the basket” as quickly as possible. This issue is known as the new-user cold-start problem. A related issue is when a new object (such as a newly released movie) enters the domain, and thus contains very few (if any) ratings in the community. This issue is called the new-item cold-start problem. Content-based (cb) systems utilize a user preference model based on the features of the objects rated by the user. Instead of deriving a user-to-item correlation and defining neighborhoods, item-to-item correlation is used.

A final note on efficiency is the lack of utilizing the system as an “expert” that should realize underlying user intentions. Subjects formulated this as a desire to endow the system with “common sense”. The system should thus be more active and present alternative choices and suggestions when user queries fail to give results. 1. A cooperative U1: is Friends on at six tonight? 1: Rather un-cooperative dialogue excerpt from a NokiaTv session. Show title in italics. 2. The same type 42 CHAPTER 3.

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