Within-teacher comparison.

Within teacher comparison between ‘gold standard’ and ‘modeling for fidelity’ professional development programs. The urban general high school teacher taught two modules from the GD curriculum to the same set of students. The first module, ID, was prepared with ‘gold standard’ PD, while the second module was prepared with MFF (the modules had different science partners). The effect size measured via Cohen's ‘d’ was very high in all cases and students made highly significant gains (p<0.0001, paired t test) in both measures regardless of the mode of PD their teacher had experienced. Within-teacher comparison.