[quote="roger_ramjet"]Obviously this is something needing careful thought in its application but I think it could be valuable in certain areas. Everyone was against goal line technology when it was first mooted, but now it seems to be working and will avoid the sorts of howlers that have happened in the past. If done carefully, so could the review system.

This works well in, for example, the NFL which is a very fragmented game and there are many natural breaks to enable reviews to carry on. Its also heavily televised and analysed from every angle by the TV crews: yet still mistakes are made despite everything.

Clearly soccer (phrase used to differentiate only) is not as obviously suited to challenges: not so many natural breaks, nothing like the saturation TV coverage of all matches and a thing called the advantage rule to accommodate along the way, so it wont be easy.

If challenges were restricted to, say, penalties, redcard instances etc and the num