All elements do not make a contribution. There are technical problems of a serious nature. Multimedia elements do not necessarily contribute significantly to understanding the content. There are few technical problems, none of a serious nature. Multimedia elements are used in creative and effective ways that exploit the particular strengths of the chosen format.
All elements make a contribution.
There are no technical problems. The screens are difficult to read and not pleasing to look at. Most screens are readable and pleasing to look at. The screens are clean, uncluttered, easy to read, and pleasing to look at. Adequately written, but contains some errors.