Single Subject Research Design (SSRD) is a research methodology where the subject, an individual or a group (i.e. a class), is followed across a period of time. SSRD has been utilised in psychology, medicine, and education. After collecting baseline data, the individual or group is involved in a series of interventions, which may include prompts designed to change specific aspects of their practice. Interventions may occur across several time periods or various forms of interventions may occur in just one period. Post-intervention evaluations help to identify changes in practice, behaviour, or outcome and establish whether the interventions are effective or not