However, when an entire class moves forward to study new skills and concepts without any individual adjustments in time or support, some students are doomed to fail.
Differentiation means that teachers allow for differing amounts of time and support for individual students in order to help them make forward progress. Not every student needs to end up at the same place bc they may have started at a different beginning.
What Differentiated Instruction Is–And Is Not: The Definition Of Differentiated Instruction
These descriptions are still too vague for many teachers. There needs to be more concrete language put to differentiation.