In recent years, there has been increasing attention toward modern educational methods in the preschool period. This stage is considered one of the most critical phases of children's development, playing a significant role in shaping their social and cognitive skills. Social skills include the ability to communicate, cooperate, interact with others, assertiveness, asking for help, self-regulation, giving praise, expressing gratitude, and taking responsibility. These are observable learned behaviors that assist individuals in establishing effective communication with others and avoiding inappropriate social behaviors.This book has 4 chapters, including: Chapter I: Comparison of the Impact of Project-Based and Play-Based Educational Approaches on the Development of Social and Cognitive Skills in Preschool ChildrenChapter II: The Project-Based Approach in Preschool EducationChapter III: Social Skills in Preschool ChildrenChapter IV: Cognitive Skills in Preschool Children and References.