Figure 1. Mean ranks for combined-science teacher students in the course of training for the SR, PK, PCK and CK scales

From

Using Vignette Testing to Measure Student Science Teachers’ Professional Competencies

Dorothee Brovelli, Katrin Bölsterli, Markus Rehm, Markus Wilhelm

American Journal of Educational Research. 2014, 2(7), 555-558 doi:10.12691/education-2-7-20