Tables :: Correct Database / Table Design

I am still new at database design, and cant quite come to terms with my project and access way of doing things.

I have to keep a register of people who participate in projects. The projects can be of two different kinds. BUT (here comes the tricky part) The projects are being evaluated on three different indicators, with each one of these having 4 measurements, in the range of 4-0. That was a quick introduction. Now let me break it down in parts.

The people:

I have made a Uniqe identifier (Social Security number (PK))

First Name
Last Name
Department (This can be 4 different departsment) made a drop-down menu type.

The Projects:

Unique identifier (Project ID (PK))
Social Security number
Project Type
Start date
End date

Project type:

Unique identifier (TypeID (PK)
Project type (Cti / Regular)

How might i design this the best way, so i can combine the people with the projects there on. And which type.

There can only be one person, but he can be on many projects. These projects can vary in type. My problem is ensuring there connected proberly.

Furthermore, once the basic design is made i need to make evaluations based on their performance if they are on the projecttype "Cti".

here i need 3 x this:

Evaluations:

Objective (range 0-4)
Baseline reading (range 0-4)
Midway reading (range 0-4)
End reading (0-4)
Success = Yes/NO (here i will do a End reading <= Objective formula).

That was a rather long list, but i have sat working on this in three whole days, and im getting a little fed up with not knowing up-and-down.