The purpose of production research is to gather together research into sections that are needed the most and sections that are high priority for starting a production for TV or film.
The methods used to research locations, equipment and finance would be done on the internet to get prices of equipment being rented out for a day. Getting location shots from all around the world to see if two different towns can match up to make one for the show/film. All of the finance researched to see what it may cost so everything can be monitored to avoid going over the budget.
The sources of information that are used to gather up would be finding out all the prices for equipment, flights, hotel, mobile homes and food costs. All this information put together will help plan out the rough amount of money that will be used in the making of the show/film.