This thesis presents a qualitative study investigating the understandings of social workers from non-statutory settings (health, hospital and mental health) of their assessment practices with children and families where child protection concerns have been identified. The study aims were to describe the considerations social workers identified as significant when undertaking such an assessment, as well as gain insight about how these considerations interact and relate. The study was developed under a constructivist paradigm influenced by post-modern and post-structuralist thinking. Data collection involved a semi-structured in-depth interview based on concepts drawn from reflective practice and the critical incident technique. The participants were asked about their agency, their role and a recent case in which they had undertaken an assessment. Data collection and analysis were consistent with constructivist grounded theory methods. Review of the literature suggests that social workers in statutory child protection practice and other settings consider factors relating to the case, themselves and their context in their assessment practice. Similar conclusions have been reached through this study. This study is unique in being the only qualitative study of social work assessment practices with child protection cases in non-statutory settings in NSW, to date. The study found that social workers identified a range of considerations as important in their assessment practice. These considerations have been grouped thematically as context, relationship, intervention, content and self, in the presentation of findings in this thesis. These themes interact and relate in ways that are unique to the individual assessment circumstances rather than in a regular or consistent manner. The findings of the study are relevant to social work practitioners, educators and researchers. The study furthers the understanding of social work assessment practice, and develops a clearer understanding and articulation of what is recognised and termed as ‘tacit knowledge’ or ‘practice wisdom’ in this particular area of social work practice. / Masters Thesis