We started are sketch are group worked together on are sketch it was very hard because we did not know what materials we should do and if hey would work are sketch was 8 it was to come up with steps because lots f them have to down because there are three tables. we tried not repat steps and materials. at the end of are sketch it had to pop a balloon so we decided to make a pulley to pop the balloon. over all we think are sketch is pretty good and will work.