There are a scattering of good ideas in this collection, but the work is weighty with vague, generalized descriptions of the differentiation as a process. A couple of ideas stand out as useful: Structured observation, sketchbooks for vocabulary, and tiering by abstraction. By the large, there are scattered lessons which can be implemented into the classroom, but the work presents all subjects, making none of them very deep. Lack of depth within areas of expertise is the major weakness of the work. Many subject areas of introduced, but very little beyond a beginning level educator.
There are some quality ideas for elementary differentiation, but almost nothing for high school. The aim of the text was lower than I expected.