CalculationsThe annotations included calculations such as that of aflight path, or total wing span, as illustrated in Fig. 3.Construction proceduresDetailed instructions were provided on how to constructthe plane, that is, a step-by-step procedure was included.Figure 4 presents an example of this design sketch.Design levelsOn coding the students’ design sketches, we initially identified four levels of increasing sophistication with respectto the types and extent of annotations presented. However, given that there was only one student who displayeda fourth level in the first design sketch (and none in theredesign), we collapsed the fourth level into the third.