I would like to "ditto" Glapor--I teach Logic also, I studied all the tutorials and have taken the cert. classes. The tutorials are a GREAT bargain--a live class with the same instructional time would easily cost hundreds of dollars. . . and the search feature in the NED player is perfect for finding exactly what you want exactly when you really need it. This saves time, and time, as they say, is $ You figure it out.