Principles of Env: chapter 6
Analysing a people group
People of the world are decided by a number of barriers which may affect the spread of the gospel.They are geographical barriers like mountains, oceans ,valleys, political boundaries that separate countries which are also separated by cultural barriers.
To effectively evangelize the world, you must study people groups of individuals who are part of evangelism not just for sake or research.
When you analyze ,you know what people are to be reached? What they are like, and how they should be reached? So you need to pray, study written materials , observe and do some interviews to be able to gather information.