A method of stirring and apparatus for stirring are provided. The method includes: a) providing a number of electro-magnetic stirrer units, each stirrer unit being moveably mounted on a stirrer support carriage; b) providing a number of locations at which stirring is to be provided by a stirrer unit; c) providing stirring at a first location from amongst the number of locations using a stirrer unit; d) providing stirring at a second location from amongst the number of locations using the same stirrer unit, the second location being different to the first location; and wherein the stirrer unit has a first position relative to the stirrer support carriage during movement between the first location and the second location and the stirrer unit has a second position relative to the stirrer support carriage at the first location and at the second location during stirring.