Early Intervention Improvement Act

Directs the Secretary of Education to reserve certain funds for incentive grants to reward States meeting performance objectives under part C, as follows: (1) 75 percent of such grants for high-quality programs in general; and (2) 25 percent for high-quality programs that make at-risk infants and toddlers eligible and that provide such services to at least three and one-half percent of children under age three in the State.

Revises provisions for transition from part C to part B (Assistance for Education of All Children with Disabilities).

Makes permanent the authorization of appropriations for part C. (The current authorization ends after FY 2002).

Revises part C eligibility conditions to include those in families where there is diagnosed serious maternal depression, confirmed parental substance abuse, or documented family violence (including child abuse). Requires all abused or neglected children under age three to be referred to the State's child find system for evaluation and, if appropriate, receipt of early intervention services.

Includes parent-child and family therapy among part C services.

Includes early intervention personnel training and professional development among State and national activities. Directs the Secretary to make grants for such pre- and in-service training and development.

Requires the Federal Interagency Coordinating Council under IDEA to study and report on mechanisms for providing service coordination from birth through age five for infants, toddlers, and children served under part C and preschool grant provisions.