Hi Ridie,
DISC is one of those quadrant based personality assessments, but it is aimed at defining personality styles and then addressing how the strangths and weaknesses of each style can be maximized or minimized for effectively working with each of the other styles. It's about using personility styles to help build teams and reduce conflict.
From one commercial site:
The DISC Profile is a nonjudgmental tool used for understanding behavioral types and personality styles. It helps people explore behavior across four primary dimensions:
Dominance: To the point, decisive and bottom line oriented. These people tend to be independent and results driven. They are strong-willed people who enjoy challenges, taking action, and immediate results.
Influence: Optimistic and outgoing. They tend to be highly social and out going. They prefer participating on teams, sharing thoughts, and entertaining and energizing others.
Steadiness: Empathetic & Cooperative. These people tend to be team players and are supportive and helpful to others. They prefer being behind the scene, working in consistent and predictable ways. They are often good listeners and avoid change and conflict
Conscientiousness: Concerned, Cautious & Correct. These people are often focused on details and quality. They plan ahead, constantly check for accuracy, and what to know "how" and "why".
I am high "I" with strong "D". I have to work on certain things to effectively lead (or be led by) high "C" and "S" folks. Who can be driven crazy by me.....