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* Efficiency: The efficiency of our interface is affected by the amount of data (i.e. collection of stream channels) that we have. The more channels, the more a user has to scroll to find a specific channel. We had a search feature and the recent history page to improve efficiency for experienced users. For new users, who are unsure of how channels are categorized, it may take some time to browse through all the categories. Overall, the main uses of SB are Catergories, Recent History, and Search, and it's very easy to navigate to them. The tabbed and thumbnail navigation should be familiar with many users.
* Errors: Errors are easily recovered from. There won't be any mode errors since there aren't different modes of operation. If the user clicks the wrong stream, all he has to do is go back on his browser. Similarly, other operations like searching and selecting a category are reversible by simply choosing the right thing after an error. Overlays have a close button, so that if a user misclicks, one can go back to the browsing screen. The only irrecoverable error one can make is to erase their cookies and cache. Doing so would mean the their recent history page will be blank, but there may be back-end solutions to this.
Design 2
This design uses an accordion to expand the relevant sections and shrink the others, but still leaving the other sections visible.
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