El constructo Educación Inicial de Base Segura, propuesto por Salinas-Quiroz (2014) se constituye en un modelo desde donde pensar la calidad de cuidado en Centros de Educación Inicial. El modelo pone en relación la influencia de los modelos operativos dinámicos, las atribuciones sobre la intencionalidad del comportamiento del infante y los estilos y prácticas de crianza del cuidador secundario profesional en su sensibilidad y las conductas de base segura y desarrollo sociocognitivo de los niños y las niñas en centros infantiles. El estudio realizado en Ciudad de México y Montevideo analiza interacciones diádicas educadora-niño/a en las edades de 18 a 36 meses. Se analizan las características de la interacción dando cuenta de las relaciones entre la sensibilidad de las educadoras y la identificación de relaciones de base segura establecidas por los niños/as con su referente educativo. El poster recoge un estudio comparado entre ambas muestras. Palabras clave Educación Inicial, Apego, Cuidado sensible ABSTRACT SECURE BASE CHILDCARE Children develop bonds with parents or paternal substitudes for protection, comfort and support. The attachment figure represents a secure base from which to explore the environment and is a haven of safety for the individual in times of stress. The association between attachment and sensitive responsiveness is clearly supported by correlational and quasi-experimental evidence (for metaanalytic reviews, see De Wolf y Van IJzendoor, 1997). Four research teams from Australia, Israel, the Netherlands, and the USA suggested, unequivocally, that quality of non-maternal care is critical for children development. Early attachment experience is represented in the form of a temporal-casual script structure organized around components of the secure-base phenomenon. Attachment Theory predicts strang links between the caregiver’s attachment representations and on infants attachment behavior. Secure Base: reliable and protective network of sensitive, available, and responsive Professional Secondary Caregivers who offer children a variety of opportunities for exploration and interaction. Shared awareness that attachment relationships need to be protected and not undermined. The shored working model of the SBC is of PSC and main caregivers supporting each other to care for their children. The poster includes a comparative study between the two samples: México D.F. and Montevideo. Key words Early Education, Attachment, Sensitive Care