The purpose of this work is to provide a critical analysis of theory in relation to psychological and emotional impact and its application to social work. I will examine the psychological and emotional impacts related to discriminatory and oppressive constructs in order to develop and demonstrate my understanding of social work within a multicultural and diverse society. I chose the internal working model and in this attachment theory as a psychological theory, widely used in social work. For the purposes of this assignment, I will focus on Bowlby as the primary theorist. “For every person, there are always two realities – external and internal. External reality is experienced in terms of the individual's internal reality, which in turn is shaped by past experience and a continuing tendency to see the present in terms of the past.'Casement, P. (1985) In order to understand internal and external realities In the world of individuals, it is essential to understand the impact of attachment, as it greatly influences the assessment, understanding of individual experiences and circumstances from a social work perspective. It is therefore considered a key theoretical perspective. “Different attachment experiences generate particular internal working models. .'Howe, D. (1999)Having adapted the internal working model theory of social relationships from the work of philosopher Kenneth Clark, Bowlby's attachment theory has had a fundamental and influential impact on social work , thus becoming a key theoretical perspective as a cornerstone of social work. staff development. Schofield (2000) highlighted the importance of theory in informing child care decision making, as it is widely used in the assessment process. therefore it is essential...... middle of article ......Attachment theory, child abuse and family support' London: Macmillan press.Lee, N (2001) Childhood and society. Open University Press Mercer, J. (2006). Understanding attachment. Westport, CT: PraegerMiller, PM (2000) Developmental problems of young children in foster care, Pediatrics, 106, p 1145-1150. Rutter (1981) Maternal Deprivation Reassessed, second edition, Harmondsworth, Penguin. Rutter, M. (1979) Attachment and the development of social relationships, in Scientific Foundations of Developmental Psychiatry, London: Heineman.Schaffer R (2007) “Introducing Child Psychology”. 2007. Oxford: Blackwell. Schofield, G. (2000) Growing up in foster care, London: UK Adoption and Fostering Agencies. Simm, M. (1991) Foster Children and the Foster Care System, Part II: Impact on the Child. Current issues in pediatrics, 21, p.345-369.