Westley and MacLean's model in 1957. * About the Mr. Westley and MacLean's model. Bruce H. Wesley’s and M.S. MacLean’s Model (1957). The model that is designed by Bruce H. Wesley and M.S. MacLean is an extension of the Newcomb’s model. It has been specifically adapted for mass media. It is based on the assumption that the messages in mass communication, pass through different points, which are known as gatekeepers, before they reach the audience. In other words, there is a mediator, who render a significant contribution in facilitating communication between the senders and the receivers . The gatekeeper concept is essentially referred to as a concept, which is mostly used in mass media and is associated with the news on frequent basis. This model focuses upon the aspect that the role of gatekeepers are regarded as crucial in facilitating the communication processes. The primary job duties of the gatekeepers are, they are required to make decisions in terms of what messages are to be transmitted and how the content has to get modified. Source of information, sender, gatekeeper, audience and feedback are regarded as important features of this model. *limitation of this model it applies only to mass media and does not take into account the relationships between mass media and other systems, through which the individuals need to get engaged in communication with each other on a continuous basis. These include, family, work, friendships, educational institutions, organizations, religious places, public places and all the other formal and informal networks, through which terms and relationships are established among individuals. Normally, communication processes are facilitated among the individuals through various forms with their family, educational institutions, organizations, communities and public places. They do not depend upon the media to such an extent as implied by this model. Therefore, it can be stated, this is one of the major limitations, which need to be alleviated in order to make the model successful.