Requirements specification is one of the most important problems in software development. The main objective of the requirements engineering is to provide a model of what is needed in a clear, precise, unambiguous and consistent statement of the system to be specified. Viewpoints are seen as a means for separating concerns in software development in accordance with a variety of criteria, which has a significant role in achieving a successful system. The paper is a survey of the current multiple viewpoints based requirements approaches; a simple example of a distributed multimedia conferencing system is used to demonstrate them.