This version of Field Trials of Health Interventions includes seven new chapters on conducting systematic literature reviews, trial governance, preliminary studies and pilot testing, budgeting and accounting, intervention costing and economic analysis, and Phase IV studies. Before new interventions are released into disease control programmes, it is essential that they are carefully evaluated in ‘field trials’. These may be complex and expensive undertakings, requiring the follow-up of hundreds, or thousands, of individuals, often for long periods. This manual was designed to provide guidance on the practical issues in great detail