This work focused on the "Psycho-social Determinants of Gender Prejudice in Science, Technology, Engineering and Mathematics (STEM)". The females were found to be underrepresented in STEM fields. The under-representation results from gender stereotype, differences in spatial skills, hierarchical and territorial segregations and discrimination on job allocation. Social-psychological interventions, role models and self affirmation were examined as strategies for increasing women representation in STEM fields (unbalancing the imbalance in gender representation in STEM).