From Sustainability Reporting To Business Value: The Case For A Sustainability Index

By Abel Sakhau Chief Sustainability Officer at Sanlam

Despite record levels of sustainability reporting activity, most large organisations still cannot  answer a deceptively simple question: Is our sustainability performance making the business  more resilient and more valuable? The gap may not necessarily be a data problem, but an  architecture problem. I argue that moving from internally designed sustainability dashboards,  which companies use for executive and board reporting, to a sustainability index may be the  structural response companies have been missing. 

The measurement gap: why integration remains elusive 

For over 20 years, corporate sustainability has been measured from the outside in: through  endless disclosure reports submitted to numerous regulators, rating agencies and investors,  including emissions tables, diversity statistics and governance scores. Within the  corporation, however, we fail to connect this information to how it supports business  strategy, determines capital allocation or fosters long-term value creation. The result is a  damaging paradox: articulate external disclosure, but an inarticulate internal measure of  what sustainability measures mean for the organisation and how they affect it. 

I often ask myself what is the root cause of this fragmentation or damaging paradox? As  sustainability professionals, we collect data across risk, finance, human resources,  operations and supply chain functions, yet with little structural coherence. Each department  owns its own metrics and its own narrative. In the absence of an integrated mechanism, the  business views sustainability as a compliance obligation rather than as a driver of business  value. And it must be the latter, simply because sustainability matters to how an organisation  grows and governs itself. 

The extent and quality of external disclosures have been significantly raised by IFRS S1 and  S2, the Global Reporting Initiative (GRI), and the Task Force on Climate-related Financial  Disclosures (TCFD). But a firm may be disclosing general sustainability and climate risks  and opportunities with great precision while its C-suite remains disconnected from whether  those risks are improving or deteriorating quarter by quarter. Disclosure quality is not the  same as management quality. 

Why the dashboard falls short 

In some cases, organisations have implemented sustainability dashboards to bridge the  measurement gap, aggregating ESG data and providing visual, real-time access to  indicators across business units. This only addresses a visibility problem, not a materiality  problem. 

The dashboard’s fundamental limitation is that the metrics present data that is not connected  or prioritised according to its relevance to strategy or stakeholder expectations. In other  words, while organisations may simultaneously track a hundred indicators, each is implicitly  weighted equally. They do not distinguish the two or three performance dimensions that  drive enterprise value.

A dashboard shows you what you are measuring. An index tells you how well you are  performing against what matters most. 

This creates a different kind of noise. Executives presented with broad dashboards respond  in one of two ways: they disengage because the complexity exceeds available attention, or  they cherry-pick indicators that reflect favourably on their own portfolio. Neither response  generates the material, integrated performance insight that sustainability reporting is  supposed to produce. The dashboard, paradoxically, can make it easier to avoid  accountability than to embrace it. 

A dashboard tracks what is happening: water consumption, tonnes of carbon, percentage of  women in senior leadership. It does not contextualise or interpret the relationship between  sustainability inputs and business outcomes, that is, what is helping or hurting the business.  The indicators on a dashboard do not address what they mean for a company’s cost of  capital, customer trust, regulatory risk or long-term competitiveness. 

The case for a Sustainability Index 

A sustainability index constructs a weighted composite score from indicators that reflect  performance, beginning with a materiality determination that identifies sustainability themes  consequential to the organisation’s business model, stakeholder relationships and risk  profiles. An index evaluates, whereas a dashboard aggregates. 

The materiality anchor of the index reflects the sustainability dimensions that directly impact  business performance. This weighting provides clarity by prioritising the most consequential  sustainability factors and generating a scorecard to support trend analysis, target setting and  business-relevant performance comparisons. 

The sustainability index shifts the organisation’s attention from “Are we compliant?” to “Are  we improving, and what does that improvement mean for the business?” By indexing  material sustainability indicators, including climate risk exposure, human capital  development, supply chain resilience and ethical conduct, in relation to business-value  drivers such as revenue growth, cost efficiency and customer retention, the organisation  makes sustainability an integral part of its internal operating model. Not simply an externality  that needs to be managed. 

Executive ownership: aligning KPIs with what the index measures At the core of this is the misalignment between an organisation’s external disclosures and  the C-suite’s internal management incentives. In the short term, incentive structures tend to  reward financial outcomes, whereas sustainability outcomes reflect discretionary qualitative  assessments. 

A sustainability index creates a credible, comparable and auditable performance measure  that can be incorporated into formal compensation structures. Including a weighted  sustainability index score alongside financial metrics has two effects: sustainability decision making is integrated into operational planning, rather than delegated to a separate reporting  function, and accountability becomes personal.

Ownership follows incentives. Executives will ensure sustainability activities are managed  with the same discipline applied to earnings and cash flow when the index score relates to  personal reward. 

Research has shown that executives with a personal mandate to improve sustainability  outcomes outperform peers on both sustainability metrics and long-term financial returns. An  index that assesses, rewards and discloses performance against a precise, weighted and  trackable score, rather than a vague commitment to “do better on ESG”, makes this  possible. 

Transparency as a strategic asset 

Having already determined materiality, assigned indicators, tracked trends and understood  the enterprise value of the data, organisations can manage sustainability performance  through an index to produce credible, decision-useful disclosures under standards such as  IFRS S1 and S2. Disclosure therefore becomes a managed process rather than an  assembly of collected data points. 

This distinction matters enormously to sophisticated stakeholders. Investors applying  double-materiality analysis, regulators assessing climate risk and customers evaluating  supply chain practices are increasingly able to identify the difference between organisations  that understand their own sustainability performance and those that report on it without  internalising it. Transparency built on an index is transparency that can be defended,  contextualised and built upon year after year. 

The sustainability index is not a silver bullet. Designing one well requires rigorous materiality  assessment, meaningful stakeholder engagement and the organisational discipline to  maintain it over time. But it is the structural response to a structural problem, and for  companies serious about making sustainability performance a genuine source of business  value, it is an investment worth making.