□ INVITED SPEECH. Language and Early Math Skill Gains in Head Start Children/Kwanghee Jung(Associate Director for Data Management and Statistics/ Assistant Professor, National Institute for Early Education Research, Rutgers University, United States) □ DESIGNATED DISCUSSION. Methodology Discussion on the Study of "Language and Early Math Skill Gains in Head Start Children"/Jeongrim Lee(Research Fellow, Korea Institute of Child Care and Education, Korea) □ General Discussion