The 180 Degree Rule/match on action

The 180 degree rule restricts the camera to only one side, the camera cannot swap sides because the view point will then change.


Match on action
Match on action or cut on action , is a component of seamless editing where a point of action (eg; handing something to someone) is shot from different angles and cut at the point of action creating a match.


You also have to make sure of Eye Line Match, which is making sure the eyes of both characters from a shot-reverse-shot match in terms of location.

http://vimeo.com/2690589