The Decision Rule in 17025

Understanding and Implementing Decision Rules in 17025

All measurements made in accredited laboratories must include some consideration of the uncertainty of measurement. Today that approach has been expanded to include the uncertainty of measurement in any statement of compliance that a laboratory may make based on the measured results.

How does uncertainty affect the demonstrated compliance of a measurement?

Learn the most common approaches in making easy use of evaluated and estimated uncertainties in making conformant statements of compliance in test and calibration reports.


  • Introduction
  • How uncertainty affects a measurement to a specification.
  • The conformance area
  • Non-conformance areas
  • The “doubt zone”
  • Guard banding
  • Qualitative results
  • Changing the rules based on knowledge of the science

Your Instructor

Helga Alexander
Helga Alexander

Helga is the Calibration Program Manager for IAS. Her experience includes 13 years at the Keithley Instrument Calibration Lab, leading to her management of their primary standards lab. She first became involved in accreditation in 2008 and became a calibration laboratory assessor in 2013.

Prior to assuming responsibility for the IAS Calibration Laboratory Accreditation Program, she spend four years with Southern Research Institute as their Quality Manager.

Today, Helga represents IAS at NCSLI and is the Convenor of the APAC Calibration Sub Committee of the APAC Technical Committee

Course Curriculum

  Decision Rule in ISO/IEC 17025
Available in days
days after you enroll

Frequently Asked Questions

When does the course start and finish?
The course starts now and never ends! It is a completely self-paced online course - you decide when you start and when you finish.
How long do I have access to the course?
How does lifetime access sound? After enrolling, you have unlimited access to this course for as long as you like - across any and all devices you own.
What if I am unhappy with the course?
We would never want you to be unhappy! If you are unsatisfied with your purchase, contact us in the first 30 days and we will give you a full refund.

Get started now!