Reflective activities and prompts that work for high school computer science students

In the online panel discussion about reflection in December 2013, many community members expressed a desire to translate the great ideas presented in the guest experts videos into specific classroom activities that are appropriate to high school students. Gail Chapman talked about the role of journaling in ECS as one example of a practice already in place. The panelists shared other possibilities, such as using the "what? so what? now what?" structure or critical incident questionnaires. What are you doing in your classes to invite students to reflect on their learning? What's working? What isn't? What would you like to do but need help pulling off?