(c) FAMILY SERVICE WORKERS - In order to improve the quality and effectiveness of staff providing in-home and other services (including …assessment, development of service plans, family advocacy, and coordination of service delivery) to families of children participating in Head Start programs, the Secretary, in coordination with concerned public and private agencies and organizations examining the issues of standards and training for family service workers, shall --

(1) review and, as necessary, revise or develop new qualification standards for Head Start staff providing such services;

(2) review, and as necessary, revise or develop maximum caseload requirements, as suggested by best practices;

(3) promote the development of model curricula (on subjects including parenting training and family literacy) designed to ensure the attainment of appropriate competencies by individuals working or planning to work in the field of early childhood and family services;

(4) promote the establishment of a credential that indicates attainment of the competencies and that is accepted nationwide; and

(5) promote the use of appropriate strategies to meet the needs of special populations (including populations of limited English proficient children).