Outline of the Research, Review of Literature, Definitions of Gender and Sex, Construction of Gender Identity, Gender Roles and Identity and Teachers' Role, The Effect of Teachers' Perceptions about Gender in Their Practices, Gender Differences in Play and Toys and Children's Preferences, Teachers' Role in Play and Teaching Relating to Gender and Greek Curriculum, Methodology, Research Strategy, Research Tool, Population and Sampling, Ethical Issues, Data Collection, Reliability and Validity, Statement of Results, Figure 1: Results' Scheme, Definitions of Gender and Sex, Construction and Identities, Gender Differences and Children's Preferences, Schooling, Analysis and Discussion, Definitions of Gender and Sex, Construction of Identities, Gender Differences and Children's Preferences, Schooling, Summary and Conclusion, Critical Reflection on Findings, List of Preferences, Appendices.