Prior to students’ working the problem, a brief classdiscussion took place on the constraints that had to bemet in designing and testing their plane to ensure thesewere understood. The students were also reminded ofthe engineering design processes they had used in theprevious problem by revisiting the engineering storybook, Engibear’s Dream (King 2013), which proved apopular contextual reminder of the design process andthe need to progressively record designs, observations,and redesigns. The basic “Engineering Design Model”(adapted from pbs.org) comprising Problem, Brainstorm,Design, Build, Test, Redesign, leading iteratively to Solution, was discussed prior to the working of the problem,with students labeling the model in their workbooks.Students were reminded, “When testing your planes,you can be thinking about ways to improve it becausewe will have a chance to redesign and retest”.