Peel, A., Sadler, T. D., Friedrichsen, P., Kinslow, A., & Foulk, J. (2018). Rigorous Investigations of Relevant Issues: A Professional Development Program for Supporting Teacher Design of Socio-Scientific Issue Units. Innovations in Science Teacher Education, 3(3). Retrieved from https://innovations.theaste.org/index.php/iste/article/view/301