What is the most critical phase in product life cycle assessment?

The most critical phase in product life cycle assessment (LCA) is the goal and scope definition phase. This stage sets the foundation for the entire assessment by clarifying the objectives, defining the system boundaries, and determining the functional unit. Properly establishing these parameters ensures that the LCA remains focused and relevant, allowing for accurate data collection and analysis in subsequent phases. A well-defined goal and scope also help in identifying the most significant environmental impacts and informing decision-making effectively.