This project aims to understand infant attachment behaviour from a design perspective. Understanding a phenomenon from a design perspective involves explaining what structures would be required in a systems design to enable that phenomenon to be produced. The particular attachment behaviour under investigation is the pattern of infant response to separations from and subsequent reunions with their carers in a controlled procedure that occurs in an unfamiliar laboratory environment. This procedure is known as the `Strange Situation Experiment'. The key finding from the Strange Situation Experiment that this work is attempting to explain is the pattern of correlations that are found between an infant's separation and reunion behaviour in the laboratory environment and the carer and infant's prior behaviour in the home environment.