We will determine the impact and cost-effectiveness of the 'BALatrine'. The 'BALatrine' – developed by Dr Budi Laksono – is an ‘amphibious’ wet/dry latrine that uses simple, cheap local technology. It is a simple squat latrine, usually constructed by the villagers themselves, at the side of a house. It comprises a 2 metre pit (with optional bamboo/concrete pipe strengthening); a latrine plate with raised footsteps (which can be used during dry periods); and a flushable U-bend porcelain bowl that may be removed. All can be made from local materials.