Suitable for gas operatives who have already qualified to refresh and update their skills. High-definition photographs and illustrations to assist with skills learning which reflect latest industry practices. Logical structure that minimises repetition so learners have clear access to the key content of the qualification. Progress checks for each learning outcome help learners to consolidate key information and plan revision  when required. Mathematical and ICT skills are carefully explained so learners fully understand the technical requirements of the course. Problem-solving case studies put content into workplace context and prepare learners for real-life situations. Practical skills are presented in clear step-by-step procedural photos that help learners visualise safe preparation and working skills. Multiple choice knowledge checks at the end of chapters test what has just been learnt and prepare learners for assessment. Language is professional and appropriate for level 3 learners preparing them for the workplace.