Pretty much what talkdownman says and quotes. Under RIS controllers were often taught that as a guideline anything within 5 miles was to be called. It was never written down as such but it was assumed as that was the lateral separation reqd if under RAS. Also that aircraft could have been on parallel or diverging tracks with no point of confliction. Under the newer ATSOCAS they really nailed down what relevant traffic was and therefore, if applied correctly, it should reduce the amount of TI passed. I worked FIS/RIS/RAS and I believe the changes really are an improvement...