Consistency and Standards

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.