cmonurz I just don’t think a review system fits football. It works in rugby to decide if a try has been scored (has the ball been put down over the line, or not); it works in cricket for run outs (is the batsman over the line, or not) and lbws (is the batsman hit in line, or not) – how would it be used in football?
Is it a penalty or not? Is it handball or not? A video doesn’t tell you if a handball was deliberate; a video doesn’t show you conclusively whether a player was looking for a foul, going down too easily, making the most of minor contact etc. Technology works for yes/no decisions, that’s it, which is why I support goal-line technology (did the ball go in the goal, or not), but not an artificial system that breaks up play and allows team to review situations with many variables.
The same way it works in Hockey.
THe video doesn't tell you anything. It's the trained official watching it and interpreting what (s)he sees in exactly the same way as a ref does with what he sees live. The only difference is the official watching the video has more, and often better, data with which to make the decision.