Perspectives are different frameworks from which to explore the knowledge around sustainable sanitation and water management. Perspectives are like filters: they compile and structure the information that relate to a given focus theme, region or context. This allows you to quickly navigate to the content of your particular interest while promoting the holistic understanding of sustainable sanitation and water management.
Why are decentralised wastewater treatment systems (DEWATS) needed? This powerpoint presentation follows this question, arguing, that decentralisation as an approach is necessary to overcome problems related to wastewater treatment.
BORDA (2003): Design Principles for Decentralized Wastewater Treatment Systems (DEWATS). Bremen Overseas Research and Development Association (BORDA)