This document was updated in November 2015 and sets out the technical guidance for acoustic measurements in accordance with Building Bulletin 93 (BB93). There is an ANC scheme in place to assess testers for compliance with these guidelines.

 
The purpose of these guidelines is to enable consistency in interpretation of the methods described in BB93, Approved Document E (ADE), and relevant ISO standards so that acoustic measurements in school buildings may be made consistently between organisations.  This guidance is not intended to be more restrictive than the standards, but to provide guidance for the application of those standards for testing in schools.