In contrast, this is where YouTube performs worst. Two examples
are:
i) Navigation history is lost when the user logs into the system,
so, for instance, the loss of videos
watched, quick lists, etc; and
ii) Comments are frequently chats between users, but as these
are not presented over a linear, dated
logic, the context and understanding are mislaid.
Error Prevention
This guideline is not observed; for example, when watching a
video in a channel page, a table of contents is shown, although every time the user clicks in any of the other
videos, the user is directed to a standard page losing any previous contextual information. In order to
re-access it, being obliged to use the back button.