Although materials were taught to them, it is important to recap and link more real life examples to help them cement their learning. Hands on task for them to compete first.
Not satisfied with what they had learnt previously, I went on to show a few videos and made them draw a concept map to showcase their learning. Pictures indeed paint a thousand words. When they drew, they could rattle off what the materials were needed to build this, create that, etc.
Look at how detailed their work are. Beautiful!