President: Do what's necessary to maintain the organization's communication and to facilitate events. This includes arranging monthly meetings, reading and replying to e-mail a few times per week, and talking with friends to think of new ideas for events. Vice President: Support President, attend meetings, help create events and assist in executing and delegating all necessary tasks.
Secretary: Take notes of meetings and distribute the notes to all officers, via e-mail. Manage the Club's Blackboard account. Send e-mail announcements of all Club events and officers' meetings to all Club members.
Treasurer: Organize funds, request monetary support from Associated Students, get checks from Associated Students.
Public Relations: Oversee the creation and distribution of posters, flyers, and announcements.
All officers (plus members): Purchase necessary supplies, food, etc.; invite speakers and guests to events and meetings; distribute and remove posters, flyers, and announcements.
Good officers work together to help each other perform Club duties. While someone must hold each official title, most work is a collaborative effort, with each person working to do what needs to be done, even if it's not part of their "job description."