MTEC and the Technology and Informatics Institute for Sustainability (TIIS) had organized the “Food Waste” activity under the circular economy concept. This event was presided over by Dr. Jitti Mungkalasiri, Director of the Technology and Informatics Institute for Sustainability (TIIS), who had given a welcome speech to the participants. Concepts and guidelines for assessing food waste quantitatively and data collection method to track food wastes were presented to science teachers and guidance teachers in Khlong Luang District in order to raise their awareness and help them contribute to reduce food waste from a leftover consumption. More than 30 participants were participating in the seminar.