Her practical example is about activating students by first having them study different selections of literature in groups. She then mixes the members of the different groups so that each student can act as an expert for the others in the second group, on the source they studied in the first group. This is a good and practical example of the Jigsaw method.
Another nice application of the Jigsaw method was done by junior lecturer Stefan van Raaij and can be found on this Canvas Online Education page.