Secondary research is when you go on things like the internet when looking for research and then finding research that already exist this is a good method as it is free and easy to get hold of the disadvantages are that it could not be reliable as anyone can write something on the internet and also it could be true but it also could be outdated
Research companies like the broadcasters audience research board (barb) collect information relating to television viewing figures. They then sell this data to television broadcasters such as BBC and ITV