This thesis portfolio is comprised of three parts: Part One – Systematic Literature Review The systematic literature review explored adoptees’ experiences of reunions with birth relatives in adulthood. Thirteen studies were identified to be reviewed through a systematic search of electronic databases. A narrative synthesis of the findings related to the types of relationships developed, impact of the reunion and factors that facilitated or hindered this process is provided. A review of methodological quality of the research is also offered. Important clinical implications, including a role for clinical psychologists, and recommendations for future research are identified. Part Two – Empirical Paper The empirical paper explored social workers’ experiences of deciding how to place siblings for adoption using Interpretative Phenomenological Analysis (IPA). Four superordinate and twelve subordinate themes were identified, which describe participants’ experiences of making decisions, and the role of their experiences and beliefs in the decision-making process. The findings are discussed in relation to theory and a decision-making model. Clinical implications and suggestions for future research are discussed. Part Three – Appendices The appendices provide supporting documentation that are important for the systematic literature review and empirical paper, plus a reflective statement and an epistemological statement.