The quality of the attachment we establish with our attachment figures has a direct impact on emotional well-being, cognitive functioning and the quality of intimate relationships. As Bowlby (1979) noted "the psychology and psychopathology of emotion is, to a large extent, the psychology and psychopathology of attachment" (p. 130). In this sense, the assessment of attachment style analyses the different strategies of emotional regulation that are put in place in stressful situations and that have the immediate aim of restoring the feeling of emotional security. The assessment allows, therefore, to detect and intervene in dysfunctional strategies characteristic of emotional insecurity which, although functional in the short term, can have a negative impact on affective, cognitive and social development. In this symposium we present 3 attachment assessment instruments developed and validated in Spanish population: (1) the Adult Attachment Questionnaire Revised (CAA-r, Melero and Cantero, 2021) aimed at adult population, (2) the Questionnaire of Attachment Indicators in the Classroom (CIA-Aula, Cantero et al., 2020) for children in Early Childhood Education and (3) the Battery of Activating Images of Mental Representations of Attachment (BIARMA, Cantero et al, 2021) which analyses the memories that a person has about the interaction that he/she maintains or maintained with his/her attachment figures during childhood and/or adolescence. The diagnostic criteria for the assessment of mental representations of attachment obtained through the incomplete histories procedure (ACST, Bretherton et al., 1990) will also be presented after its application and adaptation to the Spanish population.