Corrugated card is a great material for quick, accurate robust models and the groups were shown how to cut/score and glue it to create an accurate representation of the speaker designs.
They all found it challenging it first but quickly became more confident and each glued joint got neater as they went on.
They handled the tools accurately and managed their health and safety well.
They were surprised to see that companies like Dyson use large amounts of cardboard modelling at the concept stage of design.
You can find out more about modelling techniques at http://www.judepullen.com/designmodelling/