There are four Key Principles of Christian Community Development that Gerber Perez and his staff implement at this appropriate technology site: 1) Supporting the local church to be better equipped in serving their communities. 2) Empowering the families to be involved in each step of the project. 3) Training and working with local technicians who live in these communities. 4) Creating an environment where various relationships can work together (neighbors, Catholic and evangelical churches, etc.). This ministry provides water filters and fuel-efficient stoves to more than thirty communities in rural Guatemala.