Enhanced Sustainability Assessment in Infrastructure Business Cases—Summary

Introduction

Making Sustainability Assessment More Practical in Infrastructure Business Cases

Sustainability is increasingly becoming an expected consideration when evaluating infrastructure options and developing business cases. But while sustainability is an important part of project decision-making, assessing it is not always straightforward.

Sustainability encompasses broad environmental, social and economic considerations, many of which are difficult to objectively quantify and compare. As a result, project comparisons can sometimes focus on metrics that are less subjective and easier to measure, such as the embodied greenhouse gas emissions associated with construction materials.

Embodied carbon is an important consideration, but relying on it alone provides only a narrow view of sustainability. A more useful sustainability assessment needs to consider the broader range of impacts, risks and opportunities that can influence the long-term performance of an infrastructure project.

The role of sustainability assessment in business cases

Queensland’s BCDF includes sustainability assessment within the Preliminary Business Case and Detailed Business Case phases. Other frameworks, including those used by the Department of Transport and Main Roads (TMR), incorporate many sustainability considerations through their broader project assessment processes.

The BCDF provides a valuable structure for considering sustainability across infrastructure proposals. It identifies a range of sustainability categories, including resilience, energy and carbon, ecology, stakeholder engagement, heritage, resources, innovation and workforce sustainability.

However, applying these categories during the planning and options analysis stages can be challenging.

The BCDF sustainability assessment process was developed around an established framework and provides guidance and questions for project teams to consider. In practice, however, some of the questions can be difficult to apply when comparing multiple options, particularly when information is limited during the early stages of project development.

There is also a risk that sustainability becomes a separate assessment conducted alongside the main business case process, rather than an active input into decision-making.

This raises an important question:

How can sustainability assessment provide practical information that helps project teams compare options and make better decisions?

A more practical approach to sustainability assessment

Losee Consulting has developed an enhanced approach to sustainability assessment that works within the existing BCDF framework while providing additional insight for project teams and decision makers.

The approach combines two key elements:

• Materiality assessment to identify which sustainability issues are most important for a particular project.
• Semi-quantitative performance assessment to evaluate how different options perform against those priorities.

Rather than treating every sustainability category as equally important, the materiality assessment considers the potential risks, impacts and opportunities associated with each category, alongside its importance to relevant stakeholder groups.

This helps project teams focus their attention where it can have the greatest value.

The process is undertaken collaboratively with multidisciplinary project teams, bringing together different areas of expertise to identify and prioritise sustainability considerations.

Using materiality to identify what matters most

Sustainability is inherently broad and subjective. Not every sustainability issue will have the same level of importance for every infrastructure project.

For example, a water infrastructure project may have particularly significant considerations around water use, ecology, resilience and energy, while a different project may have greater risks or opportunities associated with heritage, community impacts, workforce or procurement.

Materiality assessment provides a structured way to identify these differences.

Losee Consulting’s approach considers both the potential for adverse impacts and the potential for beneficial opportunities, alongside the interests of different stakeholder groups. The results are used to determine the relative materiality of sustainability categories.

This does more than produce a ranking. The workshop process also encourages discussion between disciplines and can highlight issues that warrant further investigation during project planning and design.

The resulting materiality assessment is then used to weight sustainability performance when comparing options.

Bringing sustainability into options analysis

One of the key opportunities for improved sustainability assessment is during options analysis.

Infrastructure business cases often use multi-criteria analysis (MCA) to compare options against factors such as cost, risk, technical performance and other project objectives. Sustainability can be difficult to incorporate into this process because many sustainability considerations are not easily represented by a single metric.

In the absence of a broader sustainability framework, assessments may fall back on readily quantifiable measures such as embodied greenhouse gas emissions.

Our approach provides another way.

Options can be assessed against sustainability issues using the BCDF performance levels, with the results converted into a sustainability index and weighted according to the materiality assessment.

This produces a consistent way to compare the relative sustainability performance of shortlisted options.

The sustainability score can then be incorporated into the broader options analysis, giving decision makers a more comprehensive view of how the options compare.

Importantly, the approach does not suggest that sustainability should replace other decision-making criteria. Instead, it provides a structured sustainability perspective that can sit alongside cost, risk, technical and other considerations.

Carrying sustainability into the Detailed Business Case

The same approach can then be applied as the project progresses into the Detailed Business Case (DBC).

At this stage, the assessment becomes more detailed. Project teams can work through the sustainability questions associated with each category, drawing on information from technical specialists and other disciplines.

Performance levels are assessed and weighted according to materiality, producing an overall sustainability performance score and achievement level.

The information captured through this process can also provide the basis for the sustainability content within the business case, while graphical outputs can make the results easier for decision makers and Gateway review teams to understand.

This creates a stronger connection between sustainability assessment, options analysis and the broader business case process.

Supporting infrastructure sustainability beyond the business case

An effective sustainability assessment should not be viewed as a one-off exercise.

The approach developed by the Losee Consulting team also identifies sustainability initiatives and opportunities that can be carried forward as the project progresses.

This can help project teams identify opportunities for innovation, resource efficiency, resilience and other sustainability improvements early enough to influence project development.

The approach is also aligned with the content areas of the Infrastructure Sustainability (IS) rating scheme. However, the sustainability scores generated through the BCDF assessment should not be confused with IS rating points.

IS ratings applied during later project stages require detailed evidence and independent verification. The enhanced BCDF approach instead provides a practical way to assess and compare sustainability during planning and business case development.

The two processes can therefore complement each other, with early sustainability assessment helping projects identify priorities and opportunities that can support stronger sustainability outcomes later in the project lifecycle.

Making sustainability more useful for decision-making

Sustainability assessment does not need to be reduced to a single metric simply because that metric is easy to measure.

For infrastructure projects, the most important sustainability considerations will vary according to the project, its location, its stakeholders and its potential impacts and opportunities.

A practical sustainability assessment should therefore help project teams answer three questions:

• What sustainability issues matter most for this project?
• How do the options perform against those issues?
• How can the findings influence project decisions and future sustainability outcomes?

Our enhanced approach provides a structured way to answer these questions while working within established business case processes.

By combining materiality assessment with semi-quantitative performance scoring, it makes sustainability more visible, more comparable and more useful in infrastructure decision-making.

For project teams developing infrastructure business cases, this can help move sustainability assessment from a compliance exercise towards a practical tool for identifying risks, opportunities and better project outcomes.

Read the full technical paper: An enhanced method for incorporating sustainability assessment in options analysis and business cases.