Assessor directory
DSI 001 assessments are delivered by independent assessors authorised by Decision Standards Institute under the DSI 001 scheme. This directory lists the assessors currently authorised to issue DSI 001 results.
What authorisation requires
An assessor authorised by Decision Standards Institute under the DSI 001 scheme is an organisation authorised to conduct DSI 001 assessments and issue results against the published methodology. Authorisation rests on four requirements: demonstrated qualification in the methodology, documented adherence to it, independence from the organisation assessed, and accountability for the quality of the assessments produced, subject to a review mechanism that can withdraw authorisation. The requirements are set out in full on the Certification page.
Independence
The credibility of a DSI 001 result rests on the same principle as an independent audit: the assessor does not prepare the thing it assesses.
Two rules give that principle force. The assessor must be independent of the organisation it assesses, and may not assess a system or scope for which it has provided readiness, remediation or implementation support. This is the prepare-or-assess wall.
Separately, where an assessor is under common control with an evidence-preparation entity, or has any other relationship a reader would reasonably want to know about, that relationship is disclosed on every report the assessor issues, so the reader can weigh the result with the relationship in view rather than discover it later.
Self-assessment does not satisfy these requirements. An organisation that produces its own assessment has produced a self-assessment, not a certification.
Authorised assessors
Directory current as of 1 July 2026.
Attestra Pty Ltd
Attestra is authorised by Decision Standards Institute under the DSI 001 scheme to conduct DSI 001 assessments and issue the Governance Benchmark Index, the dimensional profile, the multiplier analysis, the evidence-quality findings and, where required, the remediation roadmap that together constitute a DSI 001 result.
Attestra operates under the prepare-or-assess wall. It may not assess any system or scope for which it has provided substantive readiness, remediation or implementation support.
Common control, disclosed. Attestra is under common control with the operator of the Custara evidence product. The Institute that publishes and governs the standard sits outside that ownership group. This relationship is disclosed on every report Attestra issues. An independent impartiality function is being established to hold authority over conflict decisions; until it is in place, potential conflicts are escalated and resolved conservatively, in favour of declining or disclosing rather than proceeding.
Becoming an authorised assessor
Authorisation is open to organisations that can demonstrate the four requirements and operate under the independence rules. Adding independent, non-related assessors is a priority for the standard, because a classification system is only as credible as the breadth and independence of the assessors who apply it.
Organisations interested in becoming an authorised assessor can register an expression of interest through the Institute at enquiries@decision-standards-institute.org.