A dictionary is an important device for both: EFL teachers and EFL learners. It is highly needed to conduct effective teaching and learning. Many investigations were carried out to study the foreign language learners' habits in the use of their dictionaries in reading, writing, testing and translating. This paper is shedding light on this issue; by pooling efforts carried out by researchers in forms of papers, articles and theses, on how EFL learners behave towards dictionaries in different learning situations. Different learning techniques have been discussed, to add to other experiences in the pedagogy of foreign languages. The findings of these surveys are collected here to enhance the work of foreign language teachers and learners in their classes, as well as it would be of practical help to textbook designers and lexicographers.