This bit of corporate propaganda is too long, but it makes a good point by accident. The speakers -- guys from ITT and two NGOs that received $3 million from ITT -- discuss how they have to "ask very very hard questions" before they can "solve" local water problems.
They think they are tacking "difficult" tasks because they are trying to modify one-size-fits all "solutions"* to fit local conditions. Although flexibility (customer service!) is second nature to any entrepreneur in a competitive market, it is foreign to the big engineering firms that have installed command and control water infrastructure for government clients during most of their history.
Bottom Line: Most people know what they want. If you want to help, ask them what they want and then do it.
* I still think it's funny when companies sell "solutions" that are actually products. It's not until a product is combined with habits, institutions, modifications, laws, training, etc. that it becomes part of a real solution.