Dosbarth Coala were set the challenge of investigating which material would be most suitable for the castle in Shrek. The window had to be transparent and waterproof. They drew up their own success criteria and then planned, with help, what they were going to observe, change and keep the same. Then they began measuring, drawing and making windows from plastic, cling film and card. They tested the windows by adding water (rain) and applying a hair dryer (wind) onto the material. They recorded their results in a table. They found out that the plastic would be the most suitable because it was transparent, waterproof and strong.
