When I work with teachers who are using iPads in their classroom, I get them to audit their apps and to ask so what? questions of the apps.  I need for them to know the learning and formative assessment potential of each of their apps.  If the apps is unjustified busy work, it is scrapped.  I then introduce this concept I have developed called layering, where the best features of one app are used to create content that can be enhanced in another app.  I get the teachers to base the learning intention outputs around the workflow of several apps.

Via John Pearce