alireza bazargan , university professor, one of the most fundamental problems in waste management is the short-term contracts . short-term contracts of one or two years are not profitable for the private sector, which wants to make the necessary investments. the length of the contracts should be 10 20 may it be years for the private sector in the fields of investment and culture. be economical. mohammad ali abdoli, university professor. all stages of waste management from beginning to end should be left to the private sector. the performance of municipalities in monitoring waste management is not acceptable. municipalities should determine the criteria and leave the supervision to the fourth agent. saeed muradikia, expert in waste management , assigning the executive management process of waste to the private sector. it should be done by taking advantage of the successful experiences of other countries of the world and localizing it in our country based on social and cultural appropriateness. masoud ahmadi, director of the environment office of the municipalities organization. in the