Hey David! My kids were not immediately engaged in the final production build (instead, it was like I was the engineer and they were the PM giving me feedback during reviews). They were, however, very engaged in learning the basics of coding in codepen.io when we built the early prototypes (steps 2 and 4 in the Process section) - they were amazed seeing the UI on the screen change as they updated CSS values for color, margin, border, position etc. and now are eager to take coding classes.