Recent reports from the World Health Organisation predict Ireland to be ‘the most obese nation in Europe by 2030”. In addition to this stark warning, recent research findings suggest that the country’s adolescents are falling short of physical literacy. With physical literacy being recognised as a key driver in lifelong physical activity participation, phase one of the Moving Well-Being Well study has assessed primary school children (5-13 years) in all aspects of the currently accepted physical literacy model. Areas of assessment included; fundamental movement skills (FMS) proficiency, perceived motor skill competence, motivation and confidence measures, health related fitness measures, body image, wellbeing and physical activity participation. FMS proficiency has been associated with beneficial health outcomes, and is most successfully developed during early school years, and as such is a central component of this study. Data was collected nationwide (n=2098, male 53%), and findings show that 77.5% of children scored between ‘very poor’ and ‘below average’ in FMS proficiency. There was no difference between children attending urban and rural schools, but notably, when socioeconomic status is taken into account, the schools in middle and upper-class neighbourhoods scored significantly higher (p<0.001) than those in the so called disadvantaged areas. The results also show significantly higher (p<0.001) FMS proficiency for children who achieve high levels of moderate to vigorous activity (MVPA), over those who are less active. Findings suggest that Irish primary school children fail to exhibit age-appropriate FMS proficiency. This low level of motor skills proficiency can have direct negative implications for future participation in physical activity. These findings are being used to create the structure of the Moving Well-Being Well intervention aiming at addressing these deficiencies.