Member / Subscriber

Somebody who can read comments/comment/receive news letters, etc.

Contributor

Somebody who can write and manage their posts but not publish posts.

Reviewer

A reviewer is e person - choosen by the Editor in Chief - who helps him to scan articles for (spelling)mistakes and other minor defects that would hold an article to be published.

Editor / Author

An editor is a member of a publication's team. In Quam Plures it is sSomebody who can publish and manage their own posts.

Editor in Chief / Exexutive editor

Somebody who can publish posts, manage posts as well as manage other people's posts, etc. An editor in chief is a publication's primary editor, having final responsibility for the operations and policies. The EiC ultimately decides whether a submitted article will be published. This decision is made by the editor in chief after seeking input from reviewers, who are typically chosen by the editor in chief based on their expertise.