| Theme | Sub-theme |
| Technical | Easy technology Commonly used in the region and worldwide Simple, not complicated No need for complex equipment Does not need energy to operate |
| Social | Well recognized by people Ready public acceptance |
| Political | Accepted by the government |
| Environmental | No harmful environmental impacts |
| Economic | Viable in small scale Low initial start-up and operation costs Marketable end product, can be used locally Cheapest option |