Peel, Amanda, Troy D. Sadler, Patricia Friedrichsen, Andrew Kinslow, and Jaimie Foulk. 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). https://innovations.theaste.org/index.php/iste/article/view/301.