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.
This document gives a good overview of the transect walk method. It explains exactly how to conduct a transect walk and how to continue after the walk.
WORLD BANK (n.y): Methodology for transect walk. Washington, DC: World Bank. [Accessed: 22.04.2012] PDF