The Activities, Projects, and Problem (APB) in the PLTW Gateway Automation and Robotics unit present concepts and skills incrementally and interweave mechanical builds with the programming of devices. The included spreadsheet shows scaffolding of the learning throughout the unit. It also has tabs that allow the teacher to show the skill progression for each student, using drop down menu for being about to identify, build/program, do both, or is just beginning. The tabs show the skills that are s