FAO developed some indexes to measuring rural livelihoods. The methodologies are;
· Household and Livelihoods Security (HLS) Approach,
· Household Economy Approach (HEA) approach
· Economic/financial Security Analysis Approach,
· Social Security Analysis Approach,
· Vulnerable Group Profiling approach
· Integrated Food Security and living standards Analysis System.
These approaches have been extensively used to measure impacts of projects on the livelihoods of the rural poor. Please read them and see. I hope this helps