Looking back on Collision, I learned that. Every time we make a change about our product we have to do at least3 tests because every time our force is different so, we have to calculate the average. For example, when we do our first drop the force plate detected when the first drop the force is 464But the second time it is 559 we have to make sure the average data is precise. Before this project I used to think I can make changing of my design by observation, now I think using computer and tools is more reliable. For example, when we are dropping our first design we didn’t record the data and I think it didn’t decrease the force much but when we record the data we actually got a 25% decrease of force. During this unit, I realised that testing and dropping and study our failure and improving is very valuable. We have tested many time and improving our product and we finally came up to a parachute that will make our box soft land. And we also added wing like a boom guide to improve accuracy.