The problem: Impact data isn’t built to scale
Over the past 15 years, the impact investing industry has made significant progress in acquiring and standardizing impact data, as investors have coalesced around common definitions and metrics through resources like IRIS+.
Yet approaches to organizing, characterizing and linking impact data with investment intentions remain fragmented. This fragmentation constrains investor insights, limits portfolio-level decision making, increases IMM costs, hinders communication of impact performance within and across organizations and ultimately reduces the impact potential of capital.
The increase in technical avenues for exploring datasets, including artificial intelligence (AI) models, underscores the urgency of bridging this gap.
More than data: Interoperable databases
Impact data includes a wide range of information relevant for measuring and managing impact performance, from investor inputs to investee activities and outputs, to outcomes and assumptions related to systemic impact.
A systematic approach to organizing and managing impact data across investments and portfolios is essential to understand impact results, compare performance across contexts and build a credible evidence base that can support learning, benchmarking and accountability.
Why data convergence is now feasible — and necessary
The impact investing ecosystem has matured through decades of field-building efforts and now shares a common foundation of terminology and intent. At the heart of that shared foundation is the Theory of Change (ToC) framing used by investors to understand the pathway from their contribution to outcomes.
Achieving data convergence is an indispensable next step for the industry to move beyond narrative-driven impact claims toward a more practical implementation of the ToC framing. This requires a systematic approach to organizing and labeling different data points that is both credible and scalable.
Momentum is slowly emerging. The Impact Disclosure Guidance of the Impact Disclosure Taskforce — a network of financial institutions, capital markets participants and industry stakeholders — provides guidance to investees on practically embedding the ToC framing within impact data management and reporting practice. The Common Impact Data Standard by the Common Approach to Impact Measurement sets out uniform representations of impact and provides implemented examples of data models to impact investors. The Five Dimensions of Impact framing, developed originally by the Impact Management Project and now stewarded by Impact Frontiers, contextualizes impacts of enterprises on people and the planet.
A shared structure for impact data
Alongside convergence efforts in data collection, quality assurance, metric identification (through standards like IRIS+) and calculation methodologies (through initiatives like those of the Impact Convergence Forum for Private Equity), a reference structure for impact data is a necessary precursor to systematizing impact measurement and management across investments, portfolios and the broader industry.
This approach is not a new framework or set of indicators, and it does not replace IRIS+ or other standards. Unlike metrics, standards or reporting frameworks, a data structure does not define what to measure; it defines how impact data is organized so diverse metrics and frameworks can interoperate.
A consistent data structure is a foundational building block for interoperability that can provide a framework in which to reduce and manage ambiguity, enhance transparency and support efforts towards interoperability. A structured representation of impact data based on the ToC framing embeds a fundamentally agreed-upon and broadly established logic into practical implementation.
Incorporating the ToC logic directly into the design of databases can create a shared language for representing real-world impact pathways, while remaining flexible across metrics, contexts and investment strategies.
To be effective, a structured ToC-based data model must address what categories of data are recorded, how data objects relate to each other and what constraints apply, such as rules governing data types and valid values. It operates across three levels:
• Conceptual level: defines core data categories such as impact goals, stakeholders and theory of change.
• Logical level: specifies data attributes and relationships, including inputs, activities, outputs, outcomes and evidence.
• Physical level: guides how data is recorded without prescribing a single database system.
By defining the design and logic of impact databases and information systems, this structured approach remains relevant across contexts and is scalable across investments and portfolios.
What changes if this is adopted?
For individual investment organizations: Adopting a structured ToC-based data model can streamline internal data and information management processes, increase the decision relevance of data and enhance stakeholder communication.
Structured datasets enable more efficient querying, reporting and analysis, supporting decision-useful insights and more consistent communication of impact performance internally and externally. Over time, organizations can better validate impact hypotheses, inform capital allocation decisions and leverage advanced analytics — such as creating digital twins to model impact scenarios and generating synthetic data to bridge critical data gaps.
For the ecosystem: Broad adoption can lead to greater systemic alignment and establish a common language for organizing impact data based on shared ToC logic. This supports interoperability, surfaces gaps in data and evidence, and enables system-wide learning.
Structured, AI-ready datasets can strengthen trust in impact investing, contribute to grow the evidence base and help scale capital toward effective solutions.
What it will take to succeed
GIIN research identifies several factors critical to successful data convergence:
• Low barriers to entry: Approaches must be intuitive and clearly demonstrate value to diverse stakeholders.
• Benefits at multiple levels: Individual organizations should benefit directly, with broader adoption amplifying those benefits.
• Scalable implementation: Organizations should be able to adopt the model at varying levels of sophistication, with greater benefits accruing through deeper implementation.
• Supportive ecosystem conditions: Collaboration, shared standards and external pressures — such as concerns around impact washing and rising expectations for transparency — can accelerate convergence.
Moving from concept to practice
To advance data convergence, the industry can:
• Pilot and refine structured ToC-based impact data models through real-world applications
• Develop supporting guidance, governance structures and training materials
• Test advanced analytics using structured ToC-based impact datasets
• Foster collaboration among investors, data providers and technology developers
By taking these steps, the impact investing ecosystem can unlock the full potential of impact data — supporting better decision making, stronger accountability and greater impact for people and the planet.
If you are interested in discussing more, please reach out to Panagiota Balfousia, GIIN lead impact standards strategist and developer, and director, IRIS+/IMM at [email protected]
This blog post draws on insights from the GIIN’s data convergence working group and practical experience developing impact performance tools using investor impact performance data in the GIIN’s Impact Lab. The GIIN’s data convergence working group includes members from Calvert, Deutsche Bank, EQT Partners, Fondaction, Gawa Capital, LGT Capital Partners, Lightrock, Root Capital, Temasek and others. The GIIN also thanks the following external reviewers for their valuable feedback: B Lab Global; Clarity AI; Common Approach to Impact Measurement; Green Digital Finance Alliance; Impact Convergence Forum (ICF); Impact Frontiers; Julian Kölbel (Assistant Professor for Sustainable Finance, University of St. Gallen); Rally Assets; and Upright Project. Dietrich Korb and Julian Kölbel are acknowledged in their personal capacities.