Which exam format allows the use of reference materials during an assessment?

An open book exam is specifically designed to allow candidates to refer to reference materials while answering questions. This format encourages deeper understanding and application of knowledge rather than mere memorization.

In open book exams, students are often asked to apply concepts, analyze information, and synthesize data from their resources, which can lead to a more in-depth assessment of their knowledge and skills. This can be particularly beneficial in fields like occupational health and safety, where practical applications of knowledge are essential for effective practice.

In contrast, closed book exams restrict access to any external materials, focusing solely on the candidate's memory and understanding of the subject. Practical exams typically require the demonstration of skills in real or simulated environments without the support of reference materials. Online exams may vary in format, but they generally do not imply the use of reference materials unless specified as open book. Thus, the unique characteristic of an open book exam makes it the correct choice for situations where reference materials are permitted during an assessment.