IJCA Vol 5 Issue 1 - Flipbook - Page 47
2026 | Volume 5, Issue 1
is now a fundamental expectation. In addition,
laboratories must understand and critically
evaluate performance assessment methods,
particularly with respect to the treatment of
measurement uncertainty and the suitability of
evaluation metrics such as En values.
When PT and ILC outcomes are used effectively,
they support not only accreditation compliance
but also continual improvement. Trend analysis,
management review, and integration with risk
assessment enable laboratories to identify
emerging issues, validate uncertainty estimates,
and strengthen confidence in reported results.
Within this framework, PT and ILC participation
contributes to sustained technical competence
and transparency across the calibration
community.
References
ISO/IEC 17025:2017, General requirements for the
competence of testing and calibration laboratories
ISO/IEC 17043:2023, Conformity assessment — General
requirements for the competence of proficiency testing
providers
ISO 13528:2022, Statistical methods for use in proficiency
testing by interlaboratory comparison
The International Journal of Conformity Assessment
ILAC-P9:01/2024, ILAC Policy for Proficiency Testing and/
or Interlaboratory Comparisons other than Proficiency
Testing
EA-4/18 [latest edition], Guidance on the level and
frequency of proficiency testing participation
EA-4/21 [latest edition], Guidance on the evaluation of PT
and ILC results
Author Biography
Giulia Suriani has extensive experience in
calibration accreditation programs across Europe
and the Americas, including roles as program
coordinator, team leader and peer evaluator
for accreditation bodies. In addition, Giulia has
played a key role in capacity-building initiatives by
providing technical advisory services and has been
actively involved in international accreditation and
conformity assessment committees.
She is the Program Manager for the Calibration
Laboratory Accreditation Program at the
International Accreditation Service (IAS). In this
role, she is responsible for supporting the integrity,
consistency, and technical quality of the IAS
Calibration Program and for providing technical
support.
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