Abstract-The seminar is about misunderstanding in human communication. It addresses three main issues as far as misunderstanding is concerned: 1. What is Misunderstanding? This section defines misunderstanding according to dictionaries and linguistics literature. 2. Types of Misunderstanding. After relating the classifications of misunderstandings according to the different scholars tackled the subject, the presenter classify misunderstanding into two categories: easy misunderstandings and serious misunderstandings. 3. Sources of Misunderstanding. In this section, the presenter elaborates on the possible causes of misunderstanding in human communication.