I cannot remember if it has interview tips specifically but this is a good general career book for ID:
I feel a bit weird plugging my podcast on my first post here, but you might be interested in my podcast The Wealth of Nations. It's a podcast about the economics, politics and history of economic development. Why does the average person in the Central African Republic earn one hundredth of what the average American does? Why are two thirds of people in Niger and South Sudan illiterate? Why do some countries like China grow at an incredible pace while others like Argentina and Madagascar stagnate? My podcast is about exploring questions like this and more.
Here's a list of current episodes,
1) Samsung...Massive Corruption....Underpants Gnomes....Economic Miracle?
2) Robert Mugabe, Vicious Tyrant or Tragic Hero?
3) Why Are Your Pants Made in Bangladesh?
4) A Brief Episode of Hoverboards
5) Sand and the Murder of Nitish Kumar Singh
6) Hong Kong in Honduras? (Upcoming 9/24)
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I know a little about Kenya, not sure if Malawi is the same.
Schedule a meeting with the leaders of a community ASAP. Make sure this includes the go to 'technofile' (there is usually always someone) and matriarch if they exist.
Figure out what questions you want to ask, the leaders will know the rest of the questions and have them do the survey. A survey completed by westerners is usually biased. You also should never do something that locals can do themselves.
What ever they end up wanting, someone from the village should be skyped in to every design/implementation meeting. When you do go, you should never do more than teach how to install. NEVER turn a wrench, NEVER direct, it's up to them to do it.
Some stuff I've learned the hard way: Remember if more than two people are going, you are going more for your own benefit than theirs, check your ego at the plane; they do not need you and most likely don't want you there even if they say so. They are putting up with you and being nice. Unless you are going to spend the next 10 years working with this village, you are there to impart what little knowledge you have and mostly learn how to be a wider/deeper person. Don't judge their most ugly of ways just as they shouldn't judge our McCulture. You are not a part of their culture and have no idea if what they are doing is good/evil.
I recommend this book to anyone going to east Africa. It's an easy and fun read. A lot of good examples of how westerners ruin things thinking they know better.
There are a number of places with low populations and sparse natural resources that are not only self-sufficient, but wealthy. Bermuda comes to mind. So long as there aren't barriers to investment or other sorts of economic activity, things ought to improve there. Hopefully if they ever do succeed at breaking away, Western Saharan policymakers would start by reading Robert Anderson's book Just Get Out Of The Way.