Why 'Data Reliability' Is the Core Challenge of 2026
In April 2026, Korea's Financial Services Commission finalized its ESG Disclosure Roadmap, shifting the paradigm from 'what to disclose' to 'how accurate and traceable the data is.' With the KSSB (Korea Sustainability Standards Board) climate disclosure standards becoming mandatory, companies now need audit-grade verification systems rather than simple data publication.
Global trends align. The EU CSRD mandated Limited Assurance starting in 2026 and will escalate to Reasonable Assurance by 2028. ISSB S1 and S2 standards have been adopted by over 30 countries including Korea, Japan, the UK, and Australia.
The key is data traceability. Every ton of disclosed CO2 must be traceable to its source — which site, which activity, which calculation methodology, which emission factor, who entered it, and who reviewed it. This is no different from financial statement-level internal controls.
Designing ESG Data Governance Structure
Four-Stage Process
Data Owner Responsibility Matrix
Each data item must have a clearly designated Data Owner (production), Data Steward (quality control), and Data Custodian (system operations). For example, Scope 1 direct emissions: plant manager as Owner, EHS team as Steward, IT team as Custodian.
Implementing ICOSR
At the same level as financial ICFR, companies must build ICOSR (Internal Control over Sustainability Reporting) — control activities, control testing, and deficiency reporting frameworks similar to SOX 404.
Building Assurance Infrastructure
Limited vs. Reasonable Assurance
Verifier Selection Criteria
Select verifiers certified under ISAE 3000 (international) or ISSA 5000 (new 2026 standard). Major Korean verifiers include KPC, KMR, BSI, and DNV. Changes must be disclosed at least six months in advance, with five-year rotation recommended.
Verifiable Data Formats
Securing Supply Chain Data Traceability
Scope 3 Automation
Scope 3, accounting for 70–90% of total emissions, requires data from hundreds to thousands of suppliers. Manual Excel aggregation is impossible. Automated platforms like CDP Supply Chain, EcoVadis, or proprietary supplier portals are essential.
Digital Product Passport (DPP) Integration
The EU will mandate DPP (Digital Product Passport) starting in 2027 for batteries and textiles, expanding to other categories. Carbon footprint, recyclability, and supply chain data must be traceable at the product level.
Responding to Global Buyer Requirements
Global corporations like Samsung, Hyundai, and Apple require suppliers to submit CDP reports, verification opinions, and RE100 implementation plans. Non-compliance is increasingly leading to reduced business volumes.
Phased Roadmap for SMEs
Phase 1 (0–6 months): Excel to ESG Platform
Start with GRI standards-based Excel templates, then migrate to cloud ESG platforms (Greenly, Persefoni, or Korean platforms like Glassdome, Ents) within six months. Cost: USD 8K–40K annually.
Phase 2 (6–18 months): MRV System Integration
Integrate Measurement, Reporting, and Verification into a single system. API integration with ERP, MES, and EHS systems is critical.
Phase 3 (18–36 months): Verification Certification
Start with Limited Assurance, then expand to Reasonable Assurance in year three. Conducting pre-audit simulations six months prior is recommended.
KITIM Consulting Services
KITIM provides end-to-end ESG consulting from data governance assessment to verification certification. We support data governance diagnosis, ICOSR control matrix design, ESG platform selection, pre-verification simulations, and supply chain ESG data collection systems — all in a phased approach. If you're preparing reliable data infrastructure for 2026 ESG disclosure mandates, start with KITIM's free corporate diagnostic service.