What is a life cycle assessment?

A life cycle assessment (LCA) provides a comprehensive view of how a product affects the environment at each stage of its lifecycle. This includes sourcing raw materials, production, distribution, usage, and what happens after the product's useful life ends.

For example, consider a cotton t-shirt. An LCA would assess water and energy use during cotton farming, emissions during manufacturing, transportation-related impacts, washing and drying over time, and how it’s disposed of—landfilled, incinerated, or recycled. These insights help businesses identify where they can reduce resource use and environmental harm whilst designing more sustainable products.

Who needs an LCA and why?

LCA is valuable for organisations across various industries aiming to:

• Enhance sustainability: Identify and mitigate environmental impacts.
• Comply with regulations: Meet environmental standards and reporting requirements.
• Enhance product design: Develop environmentally friendly products and processes.
• Gain competitive advantage: Demonstrate commitment to sustainability to stakeholders.

Industries such as manufacturing, construction, energy, and consumer goods often utilise LCA to inform decision-making and drive sustainable practices.

Understanding product life cycle in LCA

The product life cycle encompasses all phases a product undergoes:

• Raw material extraction: Collecting natural resources and processing them.
• Manufacturing: Converting raw materials into finished goods.
• Distribution: Transporting products to consumers.
• Usage: The consumer's use of the product.
• End-of-life: Disposal, recycling, or repurposing of the product.

By assessing each phase, LCA identifies environmental impacts and opportunities for improvement.

The four phases of a life cycle assessment

An LCA comprises four main phases:

1. Goal and scope definition
   Establishes the purpose, system boundaries, and level of detail of the study. This phase defines what will be assessed and sets the context for the analysis.
2. Life cycle inventory (LCI)
   This phase involves data collection on energy and material inputs and environmental releases. It quantifies the inputs and outputs associated with the product system.
3. Life cycle impact assessment (LCIA)
   Evaluates the potential environmental impacts using the LCI data. This phase translates data into environmental impact indicators.
4. Interpretation
   Analyses results to draw conclusions, explain limitations, and provide recommendations. This phase ensures that the findings are consistent with the defined goals and scope.

Common criticisms of life cycle assessments

While a life cycle assessment is a well-regarded tool for sustainability decision-making, it’s not without limitations. Understanding these helps organisations interpret LCA results more accurately and improve future assessments.

• Data quality and availability: LCA relies heavily on accurate, up-to-date, and geographically relevant data. Incomplete or outdated datasets can lead to misleading conclusions, especially in fast-changing supply chains or emerging markets.
• Methodological complexity: Carrying out a robust LCA requires technical expertise, access to specialised software, and a thorough understanding of system boundaries and functional units. These complexities can lead to variability in results, even for similar products.
• Lack of standardisation in practice: Despite certain standards, real-world LCAs often differ in how system boundaries, impact categories, and allocation rules are applied. This variability makes comparing assessments across products, companies, or industries difficult.
• Time and resource intensity: For many organisations, especially small and mid-sized enterprises, the cost and time required to conduct a thorough LCA may be prohibitive without external support or streamlined tools.

Overcoming these challenges requires improved access to high-quality data, scalable digital tools, and clear communication of LCA limitations to stakeholders.

How to start your own life cycle assessment

Starting an LCA doesn't have to be daunting. By following a structured approach, organisations can build a solid foundation for more sustainable decisions:

1. Define goals and scope
   Clarify why you are conducting the LCA, whether it is to reduce emissions, inform product design, or meet regulatory requirements. Set boundaries around which parts of the life cycle you will assess and establish a clear functional unit for analysis.
2. Collect relevant data Gather quantitative data on raw material use, energy consumption, transport, emissions, and waste. The quality and completeness of this data will directly affect the accuracy of your results.
3. Conduct an impact assessment Translate raw data into environmental impact categories, such as carbon footprint, water usage, or resource depletion, using a recognised methodology.
4. Interpret the results Identify hotspots where environmental impacts are highest and explore opportunities for reduction or redesign. Insights from LCA can directly support a circular economy strategy, where materials are reused, waste is minimised, and sustainability is built into product lifecycles.
5. Communicate and take action Share results in a clear and actionable manner for stakeholders. Use insights to inform sustainability reporting, product innovation, or supply chain improvements.

Purpose-built sustainability software can help ensure your LCA delivers meaningful, decision-ready insights.

With the right capabilities, digital tools can transform LCA from a technical task into a strategic advantage.

SAP Responsible Design and Production helps organisations integrate LCA insights directly into business processes. It also supports compliance with circular models such as extended producer responsibility, enabling businesses to track material flows and meet post-consumer accountability standards.

Each of these tools plays a role in making an LCA more efficient, consistent, and actionable. Explore these tools and see them in action.

What to look for in tools to support a life cycle assessment

Digital tools can make a life cycle assessment more accessible, scalable, and decision ready. The right solution should help streamline every phase, from data collection to reporting, whilst integrating into your broader sustainability and product strategy.

Key capabilities to consider include:

• Support for recognised LCA methodologies
  Choose tools that align with relevant standards and established assessment frameworks to ensure credibility and consistency.
• Access to trusted datasets
  Accurate, current data is essential. Look for tools that offer integrated access to reliable environmental datasets and material inventories.
• Flexible modelling and scenario analysis
  The ability to model variations, compare outcomes, and simulate impacts over time is critical for decision-making.
• Business process integration
  Ideally, LCA insights should feed into your existing workflows, from product design and sourcing to compliance and reporting.
• Regulatory and circularity support
  Tools that help track materials and support compliance with models like extended producer responsibility can reduce risk and improve transparency.

FAQs

SAP sustainability customers in action