The document discusses the open book examination system. It has several key advantages: it tests higher-order thinking skills like problem solving rather than memorization; reduces exam anxiety; and allows students freedom and flexibility in exams. There are two types - restricted allows limited materials, while unrestricted allows any materials. Implementing open book exams changes teaching strategies, shifting focus from information giving to facilitating understanding. It improves students' learning by discouraging copying and developing skills in knowledge application and self-learning. Potential disadvantages include students relying too heavily on materials or including irrelevant information in exams.