Dictogloss is primarily a listening and writing activity used with English Language Learners. It can certainly be done a number of different ways but, very simply-put, the teacher reads a short text, often one students are familiar with. Then, after the first time of just listening, the teacher reads it again and students write down notes of what they have heard. Next, the teacher reads it a third time and, again, the student writes down additional notes. The student then compares his/her notes with another student’s notes and they work together to develop an accurate reconstruction of the text — one that is not necessarily the exact wording, but that demonstrates its meaning accurately. Finally, the teacher reads it again and students judge how well they did.
Learn about a few of the best resources that Mr. Ferlazzo has found on using the dictogloss strategy at http://larryferlazzo.edublogs.org/2011/04/21/the-best-resources-for-learning-how-to-use-the-dictogloss-strategy-with-english-language-learners