Structure
The structure of a control answers the question, “How does this thing relate to the other things on screen?” It is important that individual elements within a control not be read separate from the rest of the control. In Flash, this is generally a matter of controlling the reading order. In an example, it may crucial that the designer ensure that the text, “level 3” is read right after the text “level 2.” In some cases, Flash reading order can get jumbled based on the position on screen. Mixing up elements of content and controls can result in a terribly confusing experience for the end user.
Adobe Flash movies can be complex in terms of layout, structure, and navigation. As a result, it can be very difficult for screen reader users to make sense of a complex Adobe Flash movie. As sites become more complex, try to add a description for the entire movie to help orient screen reader users to the structure of the site. This can be accomplished using either the root-level description or a separate information screen. The advantage of building a separate information screen is that it allows to user to get to the content without hearing the description at each refresh.