This Essential Revision Guide provides a concise overview of the NEBOSH Diploma in Occupational Health and Safety Unit B and IB Hazardous Substances and Agents (combined). Designed as an accompaniment to our full textbook, this guide provides key points from the NEBOSH Diploma syllabus in a concise format. The guide provides a great way to revise and confirm understanding in a handheld, easily portable format. Features include: a summary of the learning outcomes is given for each element, important diagrams are included throughout, there is a final section to advise on the preparation for the examination which includes guidance related to the NEBOSH command words, exam technique and a useful revision checklist.