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INTERACTION DESIGN PRINCIPLES FOR INTERACTIVE ...

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(c)<br />

(d)<br />

Figure 2.3 Examples of Gemstar-TV Guide’s GUIDE Plus+ Interface (a), (b), (c), and (d)<br />

2.4.2 Affordances<br />

(a) (b)<br />

Unlike non-interactive programming guides that require viewers to sit and wait<br />

for the programs scroll by without any control, EPGs allow viewers to navigate the<br />

listings themselves. Viewers have the ability to sort by various categories, including by<br />

time, theme, or channel. According to a report from International Marketing Reports, two<br />

of the most valuable EPG features to consumers are the program grid and genre-based<br />

program information, or the ability to find “football” under “sports,” for example.<br />

The picture-in-picture feature available in some EPGs allows viewer to stay<br />

connected to the broadcast while browsing the EPG, and increases the length of time<br />

viewers will interact with an EPG. In addition, some EPGs provide the ability to change<br />

34

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