The CER has today, 16th April 2015, published the following documents in relation to the Domestic Gas Safety Assessment (DGA), which all Registered Gas Installers (RGIs) must complete on a five yearly basis to remain registered:Operational Requirements for Certification Bodies Operating a Competency Assessment Certification Scheme for Registered Gas installers in Ireland – Issue 2 April 2015;Practical Assessment Performance Criteria Issue 2 April 2015 – Public Version; andKnowledge and Understanding Assessment Performance Criteria Issue 2 April 2015 – Public Version.