Confused about number of tables needed

[Kassy]

I am trying to add a new dimension to my database and have a table for 'Committees'. There are several diferent committees overseeing different tasks, each commitee will have a CommitteeID, description, Date formed, Date disbanded and field called 'office'. The idea was that the DB user could open a form and amend or add a new 'committee' electing a chairman(Office) secretary, Vice Chairman etc. The members elected to the committee can only be members of the club i.e they already have a membership number, and their data is stored in the tblMembers. I tried using a sub form of committee members but cannot get it working I keep getting problems with duplicates etc. Members are 'autonumber' as is committee ID bearing in mind you can have 1 member on several committees, and each member can take a different office after a period of time etc. Im getting confused now which is the best way to set up the tables and indeed how many tables I really need to store committee, committee members etc. Ideally I would like a form that you can use record selectors for to find a committee and have a page (tab) to enter members relating to the committee displayed on the first page. I know this is about forms but I need to work the tables out first.