Description

A focused course, tailored for you

ESG Assurance for Sustainability Managers

Build the technical skills to lead CSRD and ISSB-aligned sustainability assurance engagements from scoping through sign-off.

Sustainability managers at professional services firms are increasingly asked to lead ESG assurance engagements, but the methodology training they received covers financial audit, not double materiality assessment, CSRD Article 8 boundary analysis, or GHG verification procedures. The result is a scoping memo that misses the regulator's actual test and a findings trail that the partner has to reconstruct from scratch.

$199 one-time

Tailored to your situation. Access within 24 hours. 30-day money-back.

Includes a hand-built implementation playbook delivered alongside course access, generated for your specific situation.

Why this course

The technical gap shows up in three concrete places: (1) boundary documentation that excludes Scope 3 categories without a written rationale tied to the materiality assessment, leaving the engagement exposed if the auditor challenges the scope; (2) limited assurance procedures that replicate financial audit sampling rather than applying ISAE 3000 or ISSA 5000 correctly to non-financial information; (3) findings memos that describe what was observed rather than mapping observations to the specific disclosure requirements in CSRD or the ISSB standards. Each of these is a learnable methodology skill, not a judgment call that comes only with seniority.

What you walk away with

Scope a CSRD-aligned sustainability assurance engagement correctly, including Scope 3 boundary rationale that holds up to regulator review.
Apply double materiality assessment methodology to identify which topics require limited versus reasonable assurance procedures.
Design and execute ISAE 3000 and ISSA 5000 compliant assurance procedures for GHG disclosures, supply chain claims, and governance disclosures.
Build a findings documentation trail that maps observations to specific CSRD Article 8 and ISSB S1/S2 disclosure requirements.
Identify and document the disclosure gaps clients do not surface in their own boundary documents.
Deliver a findings memo structured for partner review and regulator challenge, not just internal documentation.

The 12 modules

Module 1. The regulatory landscape: CSRD, ESRS, and ISSB alignment

Maps the three overlapping disclosure regimes a sustainability manager encounters on a single engagement: CSRD Article 8 requirements, the European Sustainability Reporting Standards taxonomy, and ISSB S1/S2 thematic requirements. Covers which disclosures require assurance and at what level, and how to read a client's existing reporting against each framework to identify the assurance scope before any scoping meeting takes place.

Module 2. Double materiality assessment methodology

Explains the technical distinction between financial materiality (impact on enterprise value) and impact materiality (impact on people and environment), and the ESRS requirement to assess both. Covers how to review a client's existing materiality matrix for methodology gaps, how to identify topics that have been incorrectly excluded, and how to document the assessment trail in a form that supports an auditor's independent review of the materiality process itself.

Module 3. Boundary analysis and Scope 3 category selection

Covers the methodological steps for reviewing a client's value chain boundary document: which GHG Protocol Scope 3 categories are material by default for specific industries, what written rationale is required for any exclusion, and how to identify the categories a client has omitted without explanation. Builds the skills to write a boundary challenge memo the partner can take back to the client before the assurance scope is locked.

Module 4. ISAE 3000 and ISSA 5000: assurance standards for non-financial information

Provides a working knowledge of ISAE 3000 (Revised) and the new ISSA 5000 standard for sustainability assurance. Covers the procedural differences between limited and reasonable assurance engagements, how the practitioner's responsibilities differ from a financial audit, and how to structure the engagement letter and scope document to align with the correct standard. Includes the common misapplication of financial audit sampling to ESG data.

Module 5. GHG verification procedures: testing Scope 1 and Scope 2

Walks through the specific assurance procedures for Scope 1 and Scope 2 greenhouse gas disclosures: source identification, emission factor selection, calculation review, and boundary alignment with operational control or equity share methods. Covers what evidence to request from the client, how to identify calculation errors in the supporting workbooks, and how to document testing results in a way that ties directly back to the disclosed figure.

Module 6. Supply chain emissions: testing Scope 3 data quality

Covers the specific challenge of assuring Scope 3 disclosures where the underlying data comes from third-party suppliers using different calculation methods. Explains how to assess data quality tiers under the GHG Protocol, how to design a testing approach for category 1 (purchased goods) and category 11 (use of sold products), and how to document the limitations of supplier-provided data in the findings trail without overstating the level of assurance provided.

Module 7. Governance and social disclosures: assurance procedures beyond GHG

Extends the assurance methodology to governance disclosures (board composition, remuneration alignment, climate governance) and social disclosures (workforce data, supply chain labour standards) required under ESRS S1, S2, and G1. Covers how to select appropriate evidence for non-quantitative disclosures, how to assess completeness of governance narrative against ESRS requirements, and how to scope the assurance procedures when the underlying data is not held in a single system.

Module 8. Identifying disclosure gaps the client did not surface

Builds the skill of reading a client's sustainability report against the applicable ESRS and ISSB requirements to identify omissions and partial disclosures before the engagement is scoped. Covers the most common categories of undisclosed material topics in each sector, how to document a gap analysis that supports the scoping conversation with the client, and how to communicate a required disclosure the client was not planning to make without creating engagement risk.

Module 9. Documenting the assurance trail: workpaper standards for ESG

Covers how to structure assurance workpapers for ESG engagements so they meet the documentation requirements of ISAE 3000 and ISSA 5000 and can withstand challenge from an external reviewer or regulator. Includes the required elements of an ESG workpaper set, how to cross-reference testing evidence to the disclosed figure, and how to document the practitioner's conclusions at the assertion level for both quantitative and narrative disclosures.

Module 10. The findings memo: structure for partner review

Walks through how to write a findings memo that maps each observation to a specific CSRD Article 8 or ISSB S1/S2 disclosure requirement rather than describing what was observed in general terms. Covers how to grade findings by severity, how to present findings to a partner who has not been in the fieldwork, and how to structure the management letter so the client understands the action required before the next reporting period.

Module 11. Regulator exposure: what reviewers actually test

Covers the specific tests a regulator or enforcement body will run when reviewing a CSRD-compliant sustainability report and its accompanying assurance opinion: boundary completeness checks, Scope 3 category coverage, double materiality documentation, and consistency between the sustainability statement and the financial statements. Builds the skill of reading an assurance engagement plan from a regulator's perspective to identify where the current scope leaves the practitioner exposed.

Module 12. Building the ESG assurance skill set as a sustainable practice

Covers how to build and document an ESG assurance methodology library within a team: standardised workpaper templates, sector-specific emission factor databases, ESRS and ISSB checklist sets, and a findings classification system. Includes how to structure a knowledge transfer to junior team members so that scoping, testing, and documentation quality is consistent across engagements rather than dependent on a single experienced practitioner.

How this addresses your situation

Specific modules that map to what you said you are dealing with.

A sustainability director sends the boundary document the week before scoping. Modules 3 and 8 give you the tools to review it and identify the Scope 3 omissions before the scoping meeting.

The partner asks why the limited assurance procedures look like a financial audit. Modules 4 and 5 cover the procedural differences and how to redesign the testing approach.

The client's GHG calculation workbook has supplier data in four different emission factor methodologies. Module 6 covers data quality tiers and how to document the testing limitations.

The findings memo comes back from the partner with a note that the observations are not mapped to specific disclosure requirements. Module 10 walks through how to restructure the memo before the management letter goes out.

What you get with this course

Twelve text-based modules in the Art of Service learning environment, each with worked examples tied to real ESRS and ISSB disclosure requirements
Downloadable templates: boundary analysis worksheet, double materiality assessment review checklist, GHG verification workpaper template, ISAE 3000 engagement scoping document, findings memo structure
ESRS-to-ISSB alignment reference map showing where CSRD and ISSB S1/S2 requirements overlap and diverge
Hand-built implementation playbook tailored to the sustainability services context, delivered alongside course access within 24 hours

What you will have in hand by Day 1, Week 1, Month 1

Within 24 hours your account in the learning environment is provisioned and the tailored implementation playbook is delivered alongside it.

Before and after

Before

Scoping ESG engagements by adapting financial audit methodology, missing Scope 3 boundary gaps, writing findings memos that describe observations rather than mapping them to disclosure requirements.

After

Scoping against CSRD and ISSB requirements simultaneously, documenting boundary rationale that holds regulator review, and delivering findings memos structured for partner sign-off and management action.

What happens if you do not address this

ESG assurance is moving from voluntary to mandatory across the EU and is expanding in the US and APAC. The firms that build technical methodology depth now will lead the practice. Managers who rely on adapted financial audit procedures will find their work challenged by regulators, clients, and partners as the standard tightens.

Who it is for

Sustainability managers and senior consultants at professional services firms who are transitioning from advisory work into ESG assurance delivery. You have strong client management and project skills. You understand sustainability strategy. The missing piece is the technical assurance methodology: how to scope, how to test, and how to document in a way that satisfies external auditors and regulators.

Who this is NOT for. Experienced external auditors who already run standalone assurance practices. Financial audit managers with no sustainability services exposure who are not yet involved in ESG reporting engagements. Anyone looking for a policy overview of ESG without the procedural depth.

How it arrives

Text-based course in the Art of Service learning environment, plus downloadable templates and worked examples for every module, plus the hand-built implementation playbook delivered alongside course access.

Time investment. Twelve modules, estimated 30-45 minutes each. Most managers complete the core methodology modules (1-7) in a focused week and return to the documentation modules (8-12) during a live engagement.

Why $199 is the right number

ISCA and ICAEW offer ESG assurance guidance documents, but they are reference materials rather than skills-building courses. The big professional services training catalogues cover CSRD awareness and ISSB overview but do not drill to the workpaper and findings documentation level this course covers. A bespoke engagement methodology workshop from a specialist firm typically costs $15,000 to $30,000 and is delivered to a group, not tailored to the individual practitioner's current engagements.

FAQ

Does this cover ISSA 5000 specifically or only ISAE 3000?

Both. Module 4 covers ISAE 3000 (Revised) in detail and introduces ISSA 5000, including the key procedural differences and how to determine which standard applies to a specific engagement. The templates in module 9 are designed to meet both sets of documentation requirements.

Is this relevant for limited assurance engagements or only reasonable assurance?

Both, with a primary focus on limited assurance since that is what most sustainability managers are currently leading. Module 4 covers the procedural differences and module 9 covers how to document each level correctly.

Does the implementation playbook include sector-specific content?

The playbook is hand-built for the sustainability services context and includes the Scope 3 category patterns most common in professional services client portfolios. If your current engagements are concentrated in a specific sector, reply with that detail and the playbook will reflect it.

30-day money-back guarantee. If after a week of working through the materials this is not what you needed, reply to the receipt email and a full refund is processed. No questions, no forms.

Within 24 hours your account in the learning environment is provisioned and the tailored implementation playbook is delivered alongside it.