Disrupting Class: How Disruptive Innovation Will Change the Way the World Learns, by Clayton M. Christensen, Michael B. Horn and Curtis W. Johnson

In Chapter 1 the authors discuss the advantages of moving technology to a modular environment. 

"[The] Microsoft Windows Operating System is interdependent.  Changing just ten lines of code could necessitate rewriting millions of others.  It would cost millions of dollars to customize Windows exactly to your needs.  The economics of interdependence mandate standardizations, and we live with it.  Most of us are unaware of how our lives might improve if we had easily configurable operating systems at our disposal; it's just a luxury that had never been feasible.  Once Unix technology had matured sufficiently, however, an open source operating system such as Linux became feasible. Linux's architecture is modular and can be customized - witness how the open-source programming community continually updates and enhances it, kernel by kernel." (p. 32) 

School Key is exactly what they would predict.  A customized operating system for education.  Furthermore, our vision is to create customizations for different learners. At first probably different look-feel and functionality for older vs. younger students. Eventually customization for each individual, including the programs and functionality required for their classes and for any special needs.