... timeline hasdrag and drop capabilities for moving media in a different order, making the media longeror shorter and adding or removing the media from the presentation. The visual timelineprovides ... can be difficult to “skim” for both contentand program operation. Additionally, for commercial materials it may be difficult to get afully operational version for review. Finally, as Bradin (1999) ... also described dimensions such as language difficulty, learner focus (i.e., skill area:listening, speaking, reading, and writing), and language focus (i.e., lexis, grammar, anddiscourse) that...