Consider a Conference review database in which researchers submit their research papers for publication in the conference proceedings.

Each paper is then reviewed by reviewers. Comments of these reviewers are recorded for use in the paper selection process.

The database system caters primarily to reviewers who record answers to evaluation questions for each paper they review and make recommendations regarding whether to accept or reject the paper. The data requirements are summarized as follows.

• Authors of papers are uniquely identified by Author Id. First and last name, affiliation, email address, phone number, and mailing address are also recorded.
• Each paper is assigned a unique identifier by the system and is described by a title, an abstract and the name of the file for the paper.
• A paper may have multiple authors but one of the authors will be the contact author. An author may submit multiple papers and be contact for multiple papers. In case of multiples authors only one author submits paper.
• Every author in the system must submit at least one paper.
• Each reviewer is uniquely identified by identifier. Each reviewers first name, last name, email address and affiliation are also recorded. Authors are not allowed to be reviewers.
• Each paper is assigned multiple reviewers. A reviewer rates each paper assigned to him or her on a scale of 1 to 10 in four categories: technical merit, readability, originality and relevance to the conference. Finally, each reviewer provides an overall recommendation regarding each paper.
• Each review contains two types of written comments: one to be sent to the author and other to be shared with review committee chair only.

Design an ER diagram for this application using CHENs notation, no other notation is acceptable and will not be graded.

Write any unspecified requirements and any assumptions that you need to make the specification complete.

In your ER diagram also identify all structural constraints.