Integrating MFA with existing systems involves several key steps: 1. Data Collection: Gather data on material inputs, outputs, and accumulation within the catalytic system. 2. System Definition: Clearly define the boundaries of the catalytic system and the processes involved. 3. Model Development: Create an MFA model that represents the material flows within the system. 4. Simulation and Analysis: Use the model to simulate different scenarios and analyze the results to optimize the catalytic processes.