This report is the fourth in a series of reports which presents the result of the PFL evaluation. The report 'Preparing For Life Early Childhood Intervention: Assessing the early impact of Preparing For Life at Six Months' contains relevant background information about the programme and serves as the foundation for this report. The six month report included a detailed description of the PFL intervention and evaluation, the PFL logic model, and an explanation of the theoretical underpinnings of home visiting interventions. The six, twelve, and eighteen month reports include a discussion of the outcomes at those time points for other home visiting interventions, in addition to the results of the impact and implementation evaluation at those time points for PFL. The present report focuses on information specific to the twenty-four month evaluation, including new measures utilised as part of the twenty-four month interview, the results of the impact evaluation at twenty-four months, and new implementation data collected between eighteen and twenty-four months. The results of a qualitative study investigating the programme from the mentors' and parents' perspectives are also included. In addition, as there are now multiple waves of PFL data, the results of longitudinal analyses (dynamic analyses), which examine the impact of the programme on changes in child and parent outcomes over time, are also presented. (author abstract)