In this example the students have been sent a model answer to a question using screen cast technology. The teacher has highlighted the key points that should have been included in the answer using a word processor and then created the video where the teacher talks through the answer and what should be included. The teacher then sends the model answer to the students, who can then use the video to evaluate their own work. This can be an excellent way of doing self-evaluation since the students can listen to the video and decide what mark they should get, what was missing from their own essay etc.
The idea of the model answer video is to encourage the students to reflect and think about their own work. It is cognitively more demanding to get the students to think about their own work rather than simply provide feedback to the students. It works best where all the students are all writing the same essay since it would be impossible to create model answers for each question if each student did something different. Model examples of presentations, telling a story, describing something could all help students reflect on their own work.