Scholengemeenschap Sophianum is a state secondary school in the Netherlands. I have been using TI-Nspire handhelds and software with my students since September 2007 and TI-Nspire  Navigator since May 2009. In this lesson I used the File transfer, Screen Capture and Live Presenter  features.
In this lesson my students had needed to think mathematically by considering the properties of special cases and counter examples. These were made more obvious to the whole class due to the number of different screens that could be displayed at one time with Screen Capture. Using TI-Nspire Navigator  in this lesson enabled my students to see each others’ work and this prompted a much wider discussion in the classroom than would normally happen when the students only work with the student seated next to them.