In this SCP, students tried to determine the amounts of waste oil produced at homes and calculated the average amount of waste oil a person caused per year. Students collected data during five days and analysed this data. Students calculated the average amount of waste oil that one person produces in one year based on the data. The result shows that one person may throw or accumulate an average of 1 L waste oil in a year. Considering the population of the region, students discussed alternatives for reducing the waste and/or making use of such waste.