Who are the stakeholders and what are their needs?

All water drinkers need safe water

The women who have to carry need a more stable way to transport water

(new) The men who are responsible for maintaining the pump

Children who are most susceptible have a more dire need for safe water

(new) The institutions that install the pump need to reduce maintenance cost

the new ones essentially incorporate more of the social dynamics of the system (and pull in more of the surrounding systems)