This lecture discusses the concept of transfer coefficient in Material Flow Analysis (MFA), which indicates the relative proportion of input flowing between processes. It covers types of transfer coefficients, steady state, and quasi-stationary definitions in MFA. The lecture also explores the application of MFA in analyzing glass recycling in Switzerland, emphasizing the benefits of recycling glass and its impact on energy savings and CO2 emissions. Additionally, it explains the steps involved in performing MFA, from system definition to recommendations for system optimization.