If you use assistive technology (such as a screen reader) and need a
version of this document in a more accessible format, please email firstname.lastname@example.org.
Please tell us what format you need. It will help us if you say what assistive technology you use.
This guide is designed to help participants understand the scoring systems and statistics used for assessing results reported for the PHE food and water microbiology PT schemes.
PHE proficiency testing is also known as external quality assessment (EQA).