Final answer:
The international organization that helps define early childhood education practices is the OECD.
Step-by-step explanation:
The international organization that helps define early childhood education practices for students, families, teachers, early childhood education professionals, and policymakers is the Organization for Economic Cooperation and Development (OECD).
OECD provides evidence-based insights and policy advice to help countries improve their education systems, including early childhood education. They conduct research, develop guidelines, and share best practices on topics such as curriculum, teacher training, assessment, and support for families.
The OECD's Programme for International Student Assessment (PISA) assesses the educational performance of 15-year-old students in participating countries, providing valuable data to inform education policies and practices.