There are 2 classes of gas service worker licences, namely the Gas Service Worker and Gas Service Worker (Restricted) licences.  You can apply for the licence by submitting your application online through ELISE. Do refer to the 'Step-by-Step' guide before submitting your application. Applicants will be informed by email subsequently to attend an assessment interview.  Visit the ELISE website and go under "Apply for Licence" for information on the respective licences and eligibility criteria.