The Kaleidoscope Project commits to use only open educational resources (OER) in its course designs. OER will not only reduce the cost of textbooks, but will also create course designs that we can share, evaluate and continually improve. Our use of openly licensed content provides us with greater control and affords greater creativity in changing materials to match student needs and faculty preferences.
We have encountered challenges in the 
area of humanities. This challenge is not surprising. In the sciences there is a base set of facts that are taught in the courses. This factual content is openly available. Many different authors have provided an expression of the content using a range of materials and licensing models. In the humanities the expression itself is the object that we seek rather than the facts or content behind the expression. We cannot identify an OER for a Ray Bradbury short story, or for the writings of Malcolm Gladwell. This creates a challenge where these expressions are a core element of the curriculum.